Error: ()-indexing must appear last in an index expression. Which is the problem in line 4?? Help me pls

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Carlo Mazzavillani 2018-3-3

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回答： Sumeet Gadagkar 2018-3-6

function [A] = SecondTypeStirlingNumber(i,n) A=zeros([i n]); for j=1:n A(j)(j)=1; for k=2:i A(j)(k) = A(j-1)(k) + k*A(j)(k); end end end

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Answer 1

Sumeet Gadagkar 2018-3-6

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Hey Carlo,

While trying to index matrices in MATLAB the syntax is A(i,j) assuming 'A' is your matrix, not A(i)(j). You should also note that MATLAB indexes start from 1 and not 0, so something like A(0,0) or A(0,1) or A(2,0) will give an error which is the case for your code in line 6 in the first iteration of the for loop. Consider indexing such that a 0 index does not occur. The code is as below with the correct syntax for indexing a matrix.

    function [A] = SecondTypeStirlingNumber(i,n)
    A=zeros([i n]);
    for j=1:n 
        A(j,j)=1;
        for k=2:i 
            A(j,k) = A(j-1,k) + k*A(j,k);
        end
    end
    end