Attempt to grow array along ambiguous dimension.

a = [0:80];
b = flip(a);
multA = ones(a);
multB = ones(a);
multAB = ones(a);
for i=1:80
multA(i) = (factorial(a(i)+99))/(factorial(a(i))*factorial(99));
multB(i) = (factorial(b(i)+99))/(factorial(b(i))*factorial(99));
multAB(i) = multA(i)*multB(i);
end

Error: Attempt to grow array along ambiguous dimension.

Why do I keep getting the above error? What is the ambiguous direction?

[Stephen23]

Note that your results will be not be accurate (down to ones precision), as the values you are working with (e.g. 99!) are well above flintmax. If you require a precise output then you will need to use symbolic maths or a high-precision integer class:

https://www.mathworks.com/matlabcentral/fileexchange/22725-variable-precision-integer-arithmetic

Answer 1

[the cyclist]

The way your defined your mult variables, they are 81-dimensional arrays. I think you meant:

multA = ones(size(a));
multB = ones(size(a));
multAB = ones(size(a));