Array indices must positive or integers because I have decimals in mymatrixes

Question

Tino 2019-5-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464744-array-indices-must-positive-or-integers-because-i-have-decimals-in-mymatrixes

回答： Guillaume 2019-5-30

Hello I have a one column data D which consist of double and decimal numbers and what to compute it using this code below

K = 1;
croppedz = D(1:end-mod(end, 2*K), :); 
result = zeros(size(croppedz, 1) / 2 / K, size(croppedz, 2));  
for col = 1:size(croppedz, 2)  
    result(:, col) = sum(reshape(sort(croppedz(1:2:end, col)), K, []), 1) ./ sum(reshape(sort(croppedz(2:2:end, col)), K, []), 1);  %sort even/odd rows, reshape each into a Kx? matrix, sum across rows and divide the two sums
end
a = result;

I am getting the error

Index in position 1 is invalid. Array indices must be positive integers or logical values.
Error in kmean (line 18)
    result(:, col) = sum(reshape(sort(croppedz(1:2:end, col)), K, []), 1) ./ sum(reshape(sort(croppedz(2:2:end, col)), K, []), 1);  %sort even/odd rows, reshape each into a Kx? matrix, sum across rows and divide the two sums

Can someone help me

Tino

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Raj 2019-5-30

编辑：Raj 2019-5-30

在 MATLAB Online 中打开

Debugging will be easy if you share your data because I ran the code with

D=rand(10,1)

and got no errors.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Guillaume 2019-5-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464744-array-indices-must-positive-or-integers-because-i-have-decimals-in-mymatrixes#answer_377178

The actual indexing (of croppedz) in line 18 cannot produce an Array indices must be positive integers or logical values error. The only possible reason you can get this error is therefore if you've shadowed any of the functions used on that line by a variable, thereby changing a function call into an indexing of the variable with the same name.

My bet would be that you have a variable called sum. The other possible culprits would be sort or reshape.

Never call a variable sum (or mean, max, min, all, var, std, image, etc. the other commonly shadowed functions). You will inevitably run into this sort of problems.