MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

# generate random negative numbers

Asked by PK on 26 Jan 2013
Latest activity Commented on by Senait Senay on 3 Jan 2014

I thank if some one can help in this, how can i generate a matrix of some size for ex 100x100 with in the range of [-0.01,0] and that too with decimal values contained in it like -0.001,-0.0056 like that and also for the ranges like [-60,-30] with decimal values like -58.254,-56.985 and only 3 decimal values after the point.

Image Analyst on 26 Jan 2013

The answer to this is the example to rand() in the help.

PK on 28 Jan 2013

@ Image Analyst no rand did not work for negative numbers.

Image Analyst on 28 Jan 2013

Sorry but you are wrong. Look at Greg's code below, which is the same as the help example I referred you to. You can certainly have "a" and "b" be negative numbers. Why do you think you can't? No one said they had to be positive.

## Products

No products are associated with this question.

Answer by Matt J on 28 Jan 2013
` n=3; %number of decimal places`
` A = randi([-60,-30]*10^n,[100,100])/10^n;`

PK on 28 Jan 2013

Senait Senay on 3 Jan 2014

Answer by Greg Heath on 26 Jan 2013

x = a + (b-a)*rand(m,n);

Hope this helps.

Thank you for formally accepting my answer.

Greg