indexing must appear last in an index espression

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Bhargavkrishna Kondreddy
编辑： Jan 2016-10-26
Xsum =A(1)(:,3); error is at this point for k = 2:299 Xsum=Xsum+A(k)(:,3); end

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Jan
Jan 2016-10-25
编辑：Jan 2016-10-26
A(k) is the k.th element of the array A. Then indexing another time by "(:,3)" is not valid Matlab syntax. We cannot guess the purpose of this code, so please explain the class and dimensions of A and what you want to achieve.
[EDITED, after you provided the code]
I guess that:
Xsum = A(1)(:,3)
should be
Xsum =A{1}(:,3)
and the same for "Xsum=Xsum+A(k)(:,3)".
Compare it with the lines:
Ysum = A{1}(:,4); for m = 2:299 Ysum=Ysum+A{m}(:,4); end

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Bhargavkrishna Kondreddy
this code is meant for importing 300 .txt files and summing and mean of all values of the files and plotting the final results. clear all clc;
% Generating 2D Meshgrid [X,Y] = meshgrid(185:8:849,169:8:625); %-------------------------------
% Importing all the 300 files
files = dir( 'imageset1_*.txt'); for i=1:numel(files) A{i} = dlmread( files(i).piv, '\t', 3 , 0 ); end
% Summation of X-components of the 300 files
Xsum =A(1)(:,3); for k = 2:299 Xsum=Xsum+A(k)(:,3); end
% Taking average of the X-components of the 300 files
Xavg = Xsum/299; %Xavg(isnan(Xavg)) = 0;
% Summation of Y-components of the 300 files
Ysum = A{1}(:,4); for m = 2:299 Ysum=Ysum+A{m}(:,4); end
%Taking average of the Y-components of the 300 files
Yavg = Ysum/299; %Yavg(isnan(Yavg)) = 0;
% Calculating the magnitude of the X-component and Y-component
Zavg = sqrt(Xavg.^2+Yavg.^2);
% Making the NaN Values Zero
Zavg(isnan(Zavg)) = 0;
% Creating a Dummy Matrix of 12 x 18
Zplot = rand(58,84); %--------------------------------------------------
% Assigning the Value of Zavg in the Dummy Matrix
for e = 1:4872 %------------------------------------------------------- Zplot(e)=Zavg(e); end
%*********************************************************************** % Creating a Dummy Matrix of 12 x 18
Xplot = rand(58,84); %--------------------------------------------------
% Assigning the Value of Zavg in the Dummy Matrix
for e = 1:4872 %------------------------------------------------------- Xplot(e)=Xavg(e); end
% Creating a Dummy Matrix of 12 x 18
Yplot = rand(58,84); %--------------------------------------------------
% Assigning the Value of Zavg in the Dummy Matrix
for e = 1:4872 %------------------------------------------------------- Yplot(e)=Yavg(e); end
%***********************************************************************
%Contour Plot figure; contour(X,Y,Zplot,100,'LineWidth',3,'Fill','on','clipping','off'); xlabel('\fontsize{20}X - Pixels'); ylabel('\fontsize{20}Y - Pixels'); title('\fontsize{22}CONTOUR PLOT'); colorbar; hold on; quiver(A{1}(:,1),A{1}(:,2),Xavg,Yavg,'color','black'); axis([200 800 100 700]);%%%%%%%%%%%%%% colormap('jet');
% Setting the minimum and the maximum limit of the colormap and colorbar on the contour plot caxis([0 10]);
% Overlapping the overlapped images with the velocity vectors
figure; load('matlab.mat'); imcropped_93=imcrop(imcell1_93,[195 182 631 434]); imshow(imcropped_93); hold on; quiver(A{1}(:,1)-195,A{1}(:,2)-182,Xavg,Yavg,'color','yellow');
hold on;
  1 个评论
Jan
Jan 2016-10-26
Please format your code using the "{} Code" button. Currently it is not readable.

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