Cell contents reference from a non-cell array object.

Question

priyanka am 7 Okt. 2014

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https://de.mathworks.com/matlabcentral/answers/157686-cell-contents-reference-from-a-non-cell-array-object

Kommentiert: Regina N am 11 Feb. 2019

clear all;
clc;
%For ceating nodes(Sensor node)
num1 = input('Enter the no of nodes you want to consider in your WSN');
      radius = 30;
        for i= 1:num1
           X = rand(1,num1).*2;
           Y = rand(1,num1).*3;
        end
        X
        Y
        %Calculate Distance
        for i= 1:num1
            for j= i+1 : num1
                dist= sqrt((X{i}-X{j})^2+(Y{i}-Y{j})^2);
               % C=dist(i,j);
            end
        end
        disp(C)

I am getting error "Cell contents reference from a non-cell array object" for line dist= sqrt((X{i}-X{j})^2+(Y{i}-Y{j})^2);. Please tell me how to solve this problem.

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Answer 1

Andrew Reibold am 7 Okt. 2014

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https://de.mathworks.com/matlabcentral/answers/157686-cell-contents-reference-from-a-non-cell-array-object#answer_154222

In MATLAB Online öffnen

Don't use the curly brackets. That tells Matlab its a cell when its not. It is an array. Write like this

dist= sqrt((X(i)-X(j))^2+(Y(i)-Y(j))^2);

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muhammad illyas abdul muhji am 23 Apr. 2018

does it work for image processing as well?

Regina N am 11 Feb. 2019

In MATLAB Online öffnen

i also have same error in following code in line 13 plot...:

srcFiles = dir('C:\Users\LENOVO\Desktop\Genuine\1\*.png');  % the folder in which ur images exists
Features = cell(length(srcFiles),1) ;
Valid_points =cell(length(srcFiles),1) ;
for i = 1 : length(srcFiles)
    filename = strcat('C:\Users\LENOVO\Desktop\Genuine\1\',srcFiles(i).name);
    I1 = rgb2gray(imread(filename));
    points1 = detectSURFFeatures(I1); hold on;
    [features1, interest_points] = extractFeatures(I1, points1);
    Features{i} = features1 ;
    Valid_points{i} = interest_points ;
    figure; imshow(I1);
    plot(interest_points{i}.selectStrongest(10),'showOrientation',true);
end
Features;
Valid_points;

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Answer 2

PATRICK WAYNE am 14 Feb. 2018

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Direkter Link zu dieser Antwort

https://de.mathworks.com/matlabcentral/answers/157686-cell-contents-reference-from-a-non-cell-array-object#answer_305008

I've received this error using cell2mat. For instance, I'll have a P = 1 x 19 cell array where each cell holds a 600 x 1 double. Using

T = cell2mat(P)

works only when I run the entire m-file (giving me a 600 x 19 matrix). If I try to run it as a section in the code, I get the error. And, this line of code is NOT in any loop. I have no idea why this happens. It caused me to waste a LOT of hours.