在向量Matlab中创建随机值 [英] Create random values in vector Matlab
问题描述
我有这个向量:
人口= [3,5,0,2,0,5,10,50,0,1];
Population = [3, 5, 0, 2, 0, 5, 10, 50, 0, 1];
我只需要在向量中具有0值的地方用1到4之间的随机值来填充此向量.
And i need to fill this vector with a random value between 1 and 4 only where have 0 value in vector.
我该怎么做?
有一种方法可以使用randperm函数吗?
there's a way to do it using randperm function?
推荐答案
首先,找到零个元素,然后生成随机值,然后替换这些元素:
First, find zero elements, then generate random values, then replace those elements:
Population = [3, 5, 0, 2, 0, 5, 10, 50, 0, 1];
idx = find(Population==0);
Population(idx) = 3 * rand(size(idx)) + 1;
如果需要整数(未指定),只需在最后一条语句中四舍五入生成的随机数,例如round(3*rand(size(idx))+1)
;或使用randi
(如@OmG的回答所建议):randi([1,4], size(idx))
.
If you need integers (didn't specify), just round the generated random numbers in the last statement, like this round(3*rand(size(idx))+1)
; or use randi
(as suggested in answer by @OmG): randi([1,4], size(idx))
.
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