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How to generate a random decimal number between -1 and 1?

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Wen Shu Wong
Wen Shu Wong 2020-10-29
编辑： Stephen23 2020-10-29
I'm trying to use rand below but it is giving me [ ].
rand([-1 1]);

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Stephen23
Stephen23 2020-10-29
编辑：Stephen23 2020-10-29
Ran in:
The inputs to rand define its output size, not the output value range. Its range is fixed to 0..1, but you can adjust generate other values using some simple operations:
2*rand()-1
ans = -0.7192

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Walter Roberson
Walter Roberson 2020-10-29
rand*2-1
Note this will not generate exactly -1 or exactly 1

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