Error using horzcat dimensions are not consistent

Hi the file is attached. Kindly check this and guid me for removing the error.

Answer 1

[Guillaume]

Why are x and t symbolic? This just slows down everything for no gain. I'm not even sure that your code would work (but I don't have the symbolic toolbox so can't check).

Why can't you find the problem yourself? Break down the expression that give you the error until you locate the problem. This is exactly what we'd have to do.

Saying that, the problem looks obvious to me:

A=[a.*F b.*G c.*H 0; ...

a*F, b*G and c*H are 41x41 matrices. You then try to stick a 1x1 zero next to it. As the error tells you, that's not possible, everything you concatenate horizontally must have the same number of rows.

A = [a*F, b*G, c*H, zeros(size(x, 1), 1); ...

may work. It stick a 41x1 column vector of 0s to the end. Or you may have meant zeros(size(x)) which sticks a 41x41 matrix of 0s to the end.

You will of course have to do the same for the rest of the expressions, with zeros and ones.

[Muhammad Ali]

Thanks. the error is removed but now a new error generated that 'Error in plot33 (line 19)

surf(U)' now kindly brief me how to handle it?

[Guillaume]

Please give the full text of the error.

[Muhammad Ali]

i have attached the file.

[Muhammad Ali]

moreover the ful statement of error is

''Error using surf (line 57)

Z must be a matrix, not a scalar or vector.

Error in plot33 (line 21)

surf(x,t,U)''

[Guillaume]

You need to review your U calculation. I've no idea what it's supposed to be, but it is clearly wrong. Your U is a ratio of determinants, so obviously it's scalar. You certainly can't plot a surface when you only have one value.

In addition, all the determinants are 0, so you're performing a 0/0 division which is undefined. Hence U is Nan + 1i*NaN.

[Muhammad Ali]

why matlab is giving determinant 0, while in actual calculation they are nonzero.

is there any mistake in writing the matrices.

[Muhammad Ali]

U is basically three soliton solution.

[Guillaume]

"why matlab is giving determinant 0, while in actual calculation they are nonzero. is there any mistake in writing the matrices."

There might be an error in the way you wrote the matrix. I wouldn't know since I've no idea what they represent and anyway I don't have the time to analyse your matrices. You can check the determinant yourself with det(A), etc.

"U is basically three soliton solution."

Sorry, I don't understand this sentence. In any case, as I said, currently your U is the sum of two ratios of determinants, so it will always be scalar even if the determinants are not 0. It sounds like there's definitively a mistake in your U expression.