试图将超过2个向量传递给R中的函数 [英] Trying to pass more than 2 vectors to a function in R
问题描述
我想通过a = -1:1 和 b = -1:1 $来计算
e ^(ax + b) c $ c>用于
X
的各种值。我希望输出形式为5个元素的列表。列表中的每个元素都是3X3矩阵。
I want to compute e^(ax+b) over a=-1:1
and b=-1:1
for various values of X
. I want the output in the form a list of 5 elements. Each element in the list is 3X3 Matrix.
我使用Outer和Vectorize实现了这一点。
I did achieve this using Outer and Vectorize.
sigm = function(a=0,b=0,x){
return(exp(x*a+b))
}
sigm1 = Vectorize(function(a=-1:1,b=-1:1,x){
outer(a,b,sigm,x)
},SIMPLIFY = FALSE)
code> sigm1(x = 1:3)给出所需的输出
Now, sigm1(x=1:3)
gives the required output
[[1]]
[,1] [,2] [,3]
[1,] 0.1353353 0.3678794 1.000000
[2,] 0.3678794 1.0000000 2.718282
[3,] 1.0000000 2.7182818 7.389056
[[2]]
[,1] [,2] [,3]
[1,] 0.04978707 0.1353353 0.3678794
[2,] 0.36787944 1.0000000 2.7182818
[3,] 2.71828183 7.3890561 20.0855369
[[3]]
[,1] [,2] [,3]
[1,] 0.01831564 0.04978707 0.1353353
[2,] 0.36787944 1.00000000 2.7182818
[3,] 7.38905610 20.08553692 54.5981500
这个代码片段的唯一缺点是我使用的默认值是 a = -1:1
和 b = - 1: 1
。当我在函数调用期间尝试通过它时,它会失灵。例如
The only draw back with this code snippet is I am using the default values of a=-1:1
and b=-1:1
. When I try to pass the same during function calling, it goes haywire. E.g.
sigm1(-1:1,-1:1,1:3)
[[1]]
[,1]
[1,] 0.1353353
[[2]]
[,1]
[1,] 1
[[3]]
[,1]
[1,] 54.59815
我无法弄清楚为什么传递参数会使输出产生差异。
I am unable to figure out why passing the arguments is making this difference in output.
推荐答案
在这种情况下,您只应该向量化变量 x
。
In this case, you should only vectorize the variable x
.
sigm1 = Vectorize(function(a=-1:1,b=-1:1,x){
outer(a,b,sigm,x)}, vectorize.args = "x" ,SIMPLIFY = FALSE)
然后运行 sigm1(-1:1,-1:1,1:3)
会得到您想要的结果。
Then running sigm1(-1:1,-1:1,1:3)
will gives the result you want.
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