Matlab中的稀疏随机矩阵，其值不同于[0,1](Sparse random matrix in Matlab with values in different range than [0,1])

 如何在Matlab中创建一个稀疏随机矩阵，其值范围不同于默认值[0,1] ，比如[-1,1] ？ 我试过的两件事显然不起作用的是： 
 
p = 2 * sprand(5,5,0.1) - 1
 
 返回 
 
>> p = -1.0000 -1.0000 -1.0000 -1.0000 -1.0000
       -1.0000 -1.0000 -1.0000 -1.0000 -1.0000  
       -1.0000 -1.0000 -1.0000 -1.0000 -1.0000
       -1.0000 -1.0000 -0.4850 -1.0000 -1.0000
        0.6814 -1.0000 -1.0000 -1.0000 -1.0000
 
 和 
 
p = ceil(sprand(5,5,0.1));
p(find(p)) = 2 * rand(5) - 1;
full(p)
 
 返回 
 
>> ans =          0  0       0  0  0 
                  0  0       0  0  0
                  0  0       0  0  0
                  0  0  0.3112  0  0
             0.3112  0       0  0  0
 
 我想要一个不涉及任何循环的解决方案，只使用矩阵操作或内置Matlab函数。 

How do I create a sparse random matrix in Matlab with a value range different from the default [0,1], say [-1,1]? Two things I've tried that obviously didn't work are:
 
p = 2 * sprand(5,5,0.1) - 1
 
which returns
 
>> p = -1.0000 -1.0000 -1.0000 -1.0000 -1.0000
       -1.0000 -1.0000 -1.0000 -1.0000 -1.0000  
       -1.0000 -1.0000 -1.0000 -1.0000 -1.0000
       -1.0000 -1.0000 -0.4850 -1.0000 -1.0000
        0.6814 -1.0000 -1.0000 -1.0000 -1.0000
 
And
 
p = ceil(sprand(5,5,0.1));
p(find(p)) = 2 * rand(5) - 1;
full(p)
 
which returns
 
>> ans =          0  0       0  0  0 
                  0  0       0  0  0
                  0  0       0  0  0
                  0  0  0.3112  0  0
             0.3112  0       0  0  0
 
I would like a solution that doesn't involve any looping and that only uses matrix manipulations or built-in Matlab functions.

原文：https://stackoverflow.com/questions/30282677