Error using reshape, Size arguments must be real integers.

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Nermeen 2013-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/79706-error-using-reshape-size-arguments-must-be-real-integers

评论： Steven Lord 2023-9-12

采纳的回答： Iain

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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 ?

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Answer 1

Iain 2013-6-20

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

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Nermeen 2013-6-20

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(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 2013-6-20

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.

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Answer 2

Yan Jiang 2023-9-12

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

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Steven Lord 2023-9-12

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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.