MATLAB: Error using randi Size inputs must be scalar issue.

MATLABrandom number generator

I was using matlab 2015a version and instead of using Randi, i used Randint, but in 2017 version its not accepted and if i'm using randi then its showing eror Error using randi Size inputs must be scalar. Error in hetro_net (line 73) Xloc(s)=randi(1,1,[x_loc1(i)+1,x_loc2(i)-1]); how it can solved? Showing Error using randi Size inputs must be scalar. Error in hetro_net (line 73) Xloc(s)=randi(1,1,[x_loc1(i)+1,x_loc2(i)-1]);

Best Answer

randi([x_loc1(i)+1,x_loc2(i)-1],1,1)

or just

randi([x_loc1(i)+1,x_loc2(i)-1])

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MATLAB: Size input must be scalar using rand to generate uniformly distributed numbers

rand() does not accept the range of random values. It always generates values between 0 and 1. You need to rescale yourself.

lb = -1;
ub = 1;
a = rand(1000,1)*(ub-lb) + lb; % 1000x1 vector

MATLAB: How to create an input row only excisting randomly only out of -1 and +1

You can use the function randi to generate psuedo-random integers between 1 and 2, then replace the 2's with -1's:

x = randi( 2, 1, 100 );
x( x == 2 ) = -1;
x

The first input to randi is the value of the largest integer (where the smallest integer is implicitly set to 1), and the two consecutive inputs represent the size of the output matrix, i.e., 1 x 100.

The second lne first looks for all the values of x that equal 2 (x == 2), then assigns two these the value -1. The first operations is called logical indexing, whereas the second one is implicit expansion.

You can find more information on randi here:

https://www.mathworks.com/help/matlab/ref/randi.html

and on implicit expansion here:

https://blogs.mathworks.com/loren/2016/10/24/matlab-arithmetic-expands-in-r2016b/

Best Answer

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MATLAB: Size input must be scalar using rand to generate uniformly distributed numbers

MATLAB: How to create an input row only excisting randomly only out of -1 and +1

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