getting error creating coefficient matrix for cramers rule

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RB 2018-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/435225-getting-error-creating-coefficient-matrix-for-cramers-rule

回答： Koundinya 2018-12-14

I am implementing Cramer's Rule into MATLAB and I am stuck on the coefficient matrix part as it gives me an error

% for size of matrix
n=input('');
% co-efficient matrix
coef=zeros([n n]);

and then I get an error stating that I need real integers for the zeros function

Does anyone know how to fix this? Thanks in advance.

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Matt J 2018-12-11

编辑：Matt J 2018-12-11

在 MATLAB Online 中打开

Works fine for me, as long as a positive integer is entered, e.g.,

>> % for size of matrix
n=input('');
% co-efficient matrix
coef=zeros([n n]);
5
>> coef
coef =
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0
     0     0     0     0     0

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Answer 1

Koundinya 2018-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/435225-getting-error-creating-coefficient-matrix-for-cramers-rule#answer_352315

在 MATLAB Online 中打开

The zeros function takes array dimensions as input and returns an array of zeros.

% co-efficient matrix
coef=zeros([n n]);

Here coef would be an array of size nxn with all elements equal to zero.The dimensions of an array need to be integers (array dimesion can be 0 as well). The error you get is mostly because you're inputting a non-integer value for n.