error in double to struct not possible??

Question

preeti 2015-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/234509-error-in-double-to-struct-not-possible

评论： Guillaume 2015-8-19

function img=read_query(filename)
I=imread(filename);
[c1,c2,e1,h,v,e2]=glcm_feature_extraction(I)
   xlswrite('qfile.xlsx',[c1,c2,e1,h,v,e2]);

c1,c2,...... are floating point numbers.....

error using ==>horzcat
following error has occured converting from double to struct...conversion of double to struct is not possible.

thanks in adv

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Guillaume 2015-8-19

See this related question for the root cause of the error.

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Answer 1

Walter Roberson 2015-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/234509-error-in-double-to-struct-not-possible#answer_189726

在 MATLAB Online 中打开

Mathworks does not supply any routine named glcm_feature_extraction(), and there is no routine by that name in the File Exchange, so we have no idea what your outputs are.

Your code can only work in the form it is now if all of the outputs c1, c2, e1, h, v, e2 are either strings or numeric arrays that have the same number of rows for every entry. The error message is consistent with at least one of the items instead being a structure of some kind. You need to examine

class(c1), class(c2), class(e1), class(h), class(v), class(e2)

I speculate that either h or v is the structure.

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preeti 2015-8-19

在 MATLAB Online 中打开

function [Contrast,cor,ener,homo,V,E]=glcm_feature_extraction(I1)

 Contrast1 = graycoprops(graycomatrix(rgb2gray(I1)),'Contrast')  
 cor1= graycoprops(graycomatrix(rgb2gray(I1)), 'Correlation')
 ener1 = graycoprops(graycomatrix(rgb2gray(I1)), 'Energy')
 homo1 = graycoprops(graycomatrix(rgb2gray(I1)), 'Homogeneity')