go fmt, with some syntax fixes
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@ -9,7 +9,7 @@ import (
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* RunAuction simulates a single-bid second-price auction with no reserve price
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* RunAuction simulates a single-bid second-price auction with no reserve price
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* between all bidders emitted by the provided generator, returning the winning
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* between all bidders emitted by the provided generator, returning the winning
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* bidder and how much they paid (the maximum bid of the second-highest bidder).
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* bidder and how much they paid (the maximum bid of the second-highest bidder).
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*
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*
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* To simulate an auction between the first several bidders emitted by some
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* To simulate an auction between the first several bidders emitted by some
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* generator, use CappedBidderGenerator (in generators.go).
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* generator, use CappedBidderGenerator (in generators.go).
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*/
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*/
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@ -29,17 +29,16 @@ func RunAuction(g BidderGenerator) (float64, Bidder) {
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return prevBid, highBidder
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return prevBid, highBidder
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}
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}
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/**
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/**
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* RunAuctionVerbosely simulates a single-bid second-price auction with no
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* RunAuctionVerbosely simulates a single-bid second-price auction with no
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* reserve price between all bidders emitted by the provided generator,
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* reserve price between all bidders emitted by the provided generator,
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* returning all bidders sorted by the order they dropped out and how much the
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* returning all bidders sorted by the order they dropped out and how much the
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* winning bidder paid.
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* winning bidder paid.
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*
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*
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* Use CappedBidderGenerator to limit the size of the auction and therefore
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* Use CappedBidderGenerator to limit the size of the auction and therefore
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* the number of bidders on the list.
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* the number of bidders on the list.
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*/
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*/
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func RunAuctionVerbosely(g BidderGenerator) float64, []Bidder {
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func RunAuctionVerbosely(g BidderGenerator) (float64, []Bidder) {
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var bidders []Bidder
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var bidders []Bidder
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for b, ok := g.Generate(); ok; b, ok = g.Generate() {
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for b, ok := g.Generate(); ok; b, ok = g.Generate() {
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bidders = append(bidders, b)
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bidders = append(bidders, b)
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@ -5,25 +5,25 @@ package auctionsim
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* not threadsafe. It is a pure value type.
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* not threadsafe. It is a pure value type.
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*/
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*/
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type Bidder struct {
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type Bidder struct {
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/**
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/**
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* Value stores the real value of the item being auctioned, to this bidder.
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* Value stores the real value of the item being auctioned, to this bidder.
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* If the bidder won the auction at this price, they would make exactly
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* If the bidder won the auction at this price, they would make exactly
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* zero effective profit. It is the "rational bid" in a perfectly efficient
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* zero effective profit. It is the "rational bid" in a perfectly efficient
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* marketplace.
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* marketplace.
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*
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*
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* A bidder that wants some nonzero profit has a lower value on the item by
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* A bidder that wants some nonzero profit has a lower value on the item by
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* the amount of profit they want -- that "minimum payoff" represents an
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* the amount of profit they want -- that "minimum payoff" represents an
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* unspecified cost for the time and effort of doing the project at all.
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* unspecified cost for the time and effort of doing the project at all.
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* Other costs for getting value out of the object also decrease its value.
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* Other costs for getting value out of the object also decrease its value.
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*
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*
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* For example, a city to which hosting an F1 race is worth five billion
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* For example, a city to which hosting an F1 race is worth five billion
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* dollars, but would spend three and a half billion dollars setting up for
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* dollars, but would spend three and a half billion dollars setting up for
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* it, one billion dollars running it, and lose one billion dollars of tax
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* it, one billion dollars running it, and lose one billion dollars of tax
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* revenue due to business disruption during setup and during the event,
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* revenue due to business disruption during setup and during the event,
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* correctly values the race for negative five hundred million dollars. As
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* correctly values the race for negative five hundred million dollars. As
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* demonstrated by this example, a value can be negative.
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* demonstrated by this example, a value can be negative.
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*
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*
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*/
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*/
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Value float64
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Value float64
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/**
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/**
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@ -44,7 +44,7 @@ type Bidder struct {
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*
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*
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* To simulate an auction without cash limits, set this to positive infinity
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* To simulate an auction without cash limits, set this to positive infinity
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* for every bidder.
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* for every bidder.
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*
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*
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* A bidder's available cash can be negative. For example, a company that
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* A bidder's available cash can be negative. For example, a company that
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* cannot offer a bid to perform a job below a certain price has negative
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* cannot offer a bid to perform a job below a certain price has negative
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* effective cash on hand repersenting the maximum price they may "pay"
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* effective cash on hand repersenting the maximum price they may "pay"
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@ -79,7 +79,7 @@ func (b Bidder) BidCeiling() float64 {
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* than their calculated ceiling if they had the money to do so, but they don't.
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* than their calculated ceiling if they had the money to do so, but they don't.
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*/
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*/
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func (b Bidder) CashCapped() bool {
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func (b Bidder) CashCapped() bool {
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return b.ValueBelief() > b.Cash;
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return b.ValueBelief() > b.Cash
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}
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}
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/**
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/**
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@ -10,9 +10,9 @@ import (
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*/
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*/
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func NormalestDistribution() *NormalDistribution {
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func NormalestDistribution() *NormalDistribution {
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return &NormalDistribution{
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return &NormalDistribution{
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Rand: rand.New(rand.NewSource(int64(rand.Uint64()))),
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Rand: rand.New(rand.NewSource(int64(rand.Uint64()))),
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StdDev: 1,
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StdDev: 1,
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Mean: 0,
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Mean: 0,
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}
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}
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}
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}
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@ -24,8 +24,8 @@ func NormalestDistribution() *NormalDistribution {
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func NormalestBidderGenerator() BidderGenerator {
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func NormalestBidderGenerator() BidderGenerator {
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d := NormalestDistribution()
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d := NormalestDistribution()
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return &BiddersFromDistributions{
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return &BiddersFromDistributions{
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Values: d,
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Values: d,
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Irrationalities: d,
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Irrationalities: d,
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Bankrolls: ConstDistribution(math.Inf(1)),
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Bankrolls: ConstDistribution(math.Inf(1)),
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}
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}
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}
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}
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@ -12,7 +12,7 @@ type Distribution interface {
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* Draw returns the next float64 from the distribution and true, or
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* Draw returns the next float64 from the distribution and true, or
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* zero and false if the distribution is exhausted or otherwise unusable.
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* zero and false if the distribution is exhausted or otherwise unusable.
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*/
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*/
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Draw() float64, bool
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Draw() (float64, bool)
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}
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}
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/**
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/**
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@ -23,7 +23,7 @@ type BidderGenerator interface {
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* Generate returns the next Bidder and true, or a zero Bidder and false if
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* Generate returns the next Bidder and true, or a zero Bidder and false if
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* the generator is exhausted or otherwise unusable.
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* the generator is exhausted or otherwise unusable.
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*/
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*/
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Generate() Bidder, bool
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Generate() (Bidder, bool)
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}
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}
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/**
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/**
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@ -31,9 +31,9 @@ type BidderGenerator interface {
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* irrationality levels, and cash on hand from the provided distributions.
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* irrationality levels, and cash on hand from the provided distributions.
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*/
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*/
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type BiddersFromDistributions struct {
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type BiddersFromDistributions struct {
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Values Distribution
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Values Distribution
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Irrationalities Distribution
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Irrationalities Distribution
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Bankrolls Distribution
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Bankrolls Distribution
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}
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}
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/**
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/**
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@ -53,10 +53,10 @@ func (b *BiddersFromDistributions) Generate() (Bidder, bool) {
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return Bidder{}, false
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return Bidder{}, false
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}
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}
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return Bidder {
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return Bidder{
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Value: value,
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Value: value,
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Irrationality: irrationality,
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Irrationality: irrationality,
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Cash: cash,
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Cash: cash,
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}, true
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}, true
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}
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}
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@ -67,16 +67,16 @@ func (b *BiddersFromDistributions) Generate() (Bidder, bool) {
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* (since rand.Rand is not threadsafe).
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* (since rand.Rand is not threadsafe).
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*/
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*/
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type NormalDistribution struct {
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type NormalDistribution struct {
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Rand *rand.Rand
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Rand *rand.Rand
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StdDev float64
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StdDev float64
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Mean float64
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Mean float64
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}
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}
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/**
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/**
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* Draw implements Distribution.
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* Draw implements Distribution.
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*/
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*/
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func (n *NormalDistribution) Draw() (float64, bool) {
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func (n *NormalDistribution) Draw() (float64, bool) {
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return n.Rand.NormFloat64() * n.StdDev + n.Mean, true
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return n.Rand.NormFloat64()*n.StdDev + n.Mean, true
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}
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}
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/**
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/**
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@ -88,7 +88,7 @@ type ConstDistribution float64
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* Draw implements Distribution.
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* Draw implements Distribution.
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*/
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*/
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func (c ConstDistribution) Draw() (float64, bool) {
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func (c ConstDistribution) Draw() (float64, bool) {
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return (float64)c, true
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return float64(c), true
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}
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}
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/**
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/**
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@ -96,7 +96,7 @@ func (c ConstDistribution) Draw() (float64, bool) {
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* then stops returning values.
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* then stops returning values.
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*/
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*/
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type CappedDistribution struct {
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type CappedDistribution struct {
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D Distribution
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D Distribution
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Lim int64
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Lim int64
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}
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}
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@ -116,7 +116,7 @@ func (c *CappedDistribution) Draw() (float64, bool) {
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* BidderGenerator, then stops returning values.
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* BidderGenerator, then stops returning values.
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*/
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*/
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type CappedBidderGenerator struct {
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type CappedBidderGenerator struct {
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G BidderGenerator
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G BidderGenerator
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Lim int64
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Lim int64
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}
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}
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