Why do I get "Index exceeds matrix dimensions"?

Question

Blake 2017-10-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/362056-why-do-i-get-index-exceeds-matrix-dimensions

编辑： Cedric 2017-10-19

I'm trying to create a matrix of two letter combinations from a string x. A(1,1) = # of aa's, A(1,2) = # of ab's etc. to A(26,26) = # of zz's. The text is all lower case and I thought I solved it, but I keep getting this error message. Ideas as to why? How would I fix / avoid this in the future?

alphabet = 'a':'z';
A = zeros(26);
for j = alphabet
    for i = alphabet
        y = strcat(alphabet(i),alphabet(j));
        A(i,j) = length(strfind(x,y));
    end
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Cedric 2017-10-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/362056-why-do-i-get-index-exceeds-matrix-dimensions#answer_286532

编辑：Cedric 2017-10-19

在 MATLAB Online 中打开

Numeric arrays cannot store arrays of two characters. Try with a cell array. Also, don't index arrays with characters but with numeric indices

 alphabet = 'a' : 'z' ;
 A = cell( 26, 26 ) ;
 for j = 1 : length( alphabet )
    for i = 1 : length( alphabet )
        A{i,j} = [alphabet(i),alphabet(j)] ;      % Concatenation of two letters.
    end
 end