在for循环R中,将`curve()`中的x和y保存起来? [英] Saving x, and y from `curve()` in a for loop R?

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问题描述

我有一个名为 all.priors 参见下面的R代码)的函数。我的目标是从 curve()获取 x y 循环中调用$ c>,并保存这些 x s和 y code> s作为对象 h



(我想要 101 行和 2 * length(d)列中的 h 。 2列包含 x y 来自 curve()中运行循环。)



问题:



如何正确保存 x s和 y code> curve()调用? [我得到错误:矩阵上的下标数量不正确]

  all.priors =函数(a,b,lo,hi,d,Bi = 55,n = 1e2){
$ bh =矩阵(NA,101,2 *长度(d))$ b $ ($)
=函数(x)得到(d [i])(x,a,b)
prior =函数(x) p(x)/ integrate(p,lo,hi)[[1]]
似然函数(x​​)dbinom(Bi,n,x)
posterior =函数(x) *可能性(x)
h [i,] =曲线(posterior,ty =n,ann = FALSE,yaxt =n,xaxt =n,add = i!= 1,bty =


$ b#使用示例:
all.priors(lo = 0,hi = 1,a = 2,b = 3,d = c dgammadnormdcauchydlogis))


解决方案

你只需要仔细地将值放在矩阵中,然后从你的函数返回矩阵。 (a,b,lo,hi,d,Bi = 55,n = 1e2) {
$ bh =矩阵(NA,101,2 *长度(d))

(i为1:长度(d)){
p =函数(x,a),b(b,b)
先验函数(x)p(x)/ integral(p,lo,hi)[b]函数(x)dbinom(Bi,n,x)
posterior = function(x)prior(x)* likelihood(x)
cv < - curve(posterior,ty =n,ann = FALSE,yaxt =n,xaxt =n,add = i!= 1,bty =n)
h [,i * 2-1] < - cv $ x
h [,i * 2] < - cv $ y
}
h
}
all.priors(lo = 0,hi = 1,a = 2,b = 3, d = c(dgamma,dnorm,dcauchy,dlogis))


I have a function called all.priors (see R code below). My goal is to get the x and y from the curve() call inside the for loop, and save these xs and ys as object h.

(I want to have 101 rows, and 2*length(d) columns in h. This way, each 2 columns, contain x and y from a curve() run in the for loop.)

Question:

how can I correctly save the xs and ys from the curve() call? [I get the error: incorrect number of subscripts on matrix]

all.priors = function(a, b, lo, hi, d, Bi = 55, n = 1e2){

h = matrix(NA, 101, 2*length(d)) 

for(i in 1:length(d)){
         p = function(x) get(d[i])(x, a, b)
     prior = function(x) p(x)/integrate(p, lo, hi)[[1]]
likelihood = function(x) dbinom(Bi, n, x)
 posterior = function(x) prior(x)*likelihood(x)
     h[i,] = curve(posterior, ty = "n", ann = FALSE, yaxt = "n", xaxt = "n", add = i!= 1, bty = "n")
     }
}
#Example of use:
all.priors(lo = 0, hi = 1, a = 2, b = 3, d = c("dgamma", "dnorm", "dcauchy", "dlogis"))

解决方案

You just need to carefully place the values in the matrix, and then return the matrix from your function. try this

all.priors = function(a, b, lo, hi, d, Bi = 55, n = 1e2){

  h = matrix(NA, 101, 2*length(d)) 

  for(i in 1:length(d)){
    p = function(x) get(d[i])(x, a, b)
    prior = function(x) p(x)/integrate(p, lo, hi)[[1]]
    likelihood = function(x) dbinom(Bi, n, x)
    posterior = function(x) prior(x)*likelihood(x)
    cv <- curve(posterior, ty = "n", ann = FALSE, yaxt = "n", xaxt = "n", add = i!= 1, bty = "n")
    h[,i*2-1] <- cv$x
    h[,i*2] <- cv$y
  }
  h
}
all.priors(lo = 0, hi = 1, a = 2, b = 3, d = c("dgamma", "dnorm", "dcauchy", "dlogis"))

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