Error using reshape, Size arguments must be real integers.

Hi, please, i have a question. every time i run this function on Matlab

my=repmat(mean(reshape(Y,T,N)),T,1);

i got error message saying that:

Error using Reshape.

 (size arguments must be real intergers).

How can i solve this problem please ?

Answer 1

[Iain]

You could ensure that T, and N are positive whole numbers...

[Nermeen]

T, and N are positive but (Y)is not.

so, is there any solution for this?

Thanks

[Nermeen]

(Y) is my dependant variable which include negative values.

I defined (T) before as following:

 T=length(Y)/N;

so, do u think that this reason for the Error ? and if yes, what can i do ?

Thanks

[James Tursa]

T needs to be an integer value. If length(Y) is not a whole multiple of N, then it won't be in your equation for T.

Answer 2

[Yan Jiang]

Check the type of variables T and N and verify they are integer would solve this this problem.

[Steven Lord]

The type of T and N isn't what's important, though casting them to an integer type could accidentally resolve the problem. The values of T and N must be integer values. For example, I can reshape an array with 12 elements into a 3-by-4 array:

x = 1:12

x = 1×12

1 2 3 4 5 6 7 8 9 10 11 12

y = reshape(x, 3, 4)

y = 3×4

1 4 7 10 2 5 8 11 3 6 9 12

But I can't reshape it to have 8 columns because having an array with 1.5 rows doesn't make sense.

try
    z = reshape(x, [], 8) % WILL ERROR
catch ME
    fprintf("This call threw error:\n%s\n", ME.message)
end

This call threw error:
Product of known dimensions, 8, not divisible into total number of elements, 12.

Trying to specify 1.5 rows will throw an error as well.

try
    z = reshape(x, 1.5, []) % WILL ERROR
catch ME
    fprintf("This call threw error:\n%s\n", ME.message)
end

This call threw error:
Size arguments must be real integers.

Nor can I reshape it to have 0 rows.

try
    z = reshape(x, 0, []) % WILL ERROR
catch ME
    fprintf("This call threw error:\n%s\n", ME.message)
end

This call threw error:
Product of known dimensions, 0, not divisible into total number of elements, 12.

A complex number of rows won't work either.

try
    z = reshape(x, 3i, []) % WILL ERROR
catch ME
    fprintf("This call threw error:\n%s\n", ME.message)
end

This call threw error:
Size argument cannot be complex.