Attempt to reference field of non-structure array.

I have many files, which are made as a loop, each one has two columns with text line, I want to draw the map for it by this script. but I faced this problem ' Attempt to reference field of non-structure array'.

clear xstep=18; %number of x steps

    ystep=34;  %number of y steps

    map0V = zeros(ystep+1, xstep+1);

    data0V = zeros((ystep+1)*(xstep+1),3);

for j=0:xstep;

    for i=0:ystep;

        filename = strcat('Read330uW_S5_Bg0VLoop1_',int2str(j), 'Loop2_', int2str(i),     '.dat');

scana=importdata(filename);
rowa=scana.data(:,end);
map0V(end - i,j+1)=2.22.*mean(rowa(2:end))/1E5;

% rearrange matrix for origin plotting

 data0V(j*(ystep+1)+(i+1),1) = j-2; % x co-ords in 1st col
data0V(j*(ystep+1)+(i+1),2) = i; % y co-ords in 2nd col
data0V(j*(ystep+1)+(i+1),3) = map0V(end - i,j+1); % Ipc value in 3rd col
   end
end

%plot 'map matrix'

 figure;
 pcolor(-2:23, linspace(12,0,13), map0V);
 axis equal;
 caxis([-2E-10,2E-10]);
 colorbar

% Create colormap that is blue for negative, red for positive, % and a chunk inthe middle that is black.

 redColorMap = [zeros(1, 128), linspace(0, 1, 128)];
 blueColorMap = [linspace(1, 0, 128), zeros(1, 128)];
 colorMap = [redColorMap; zeros(1, 256); blueColorMap]';
 colormap(colorMap);

% shading interp; %labels

 title('Graphene Photodetector Vsd=0V');
 xlabel('X (\mu m)');
 ylabel('Y (\mu m)');

%get white coordinate lines

 grid on;

% set(gca,'XColor','w',... % 'YColor','w') % set(get(gca,'XLabel'),'Color','w') % set(get(gca,'YLabel'),'Color','w')

%save matrix

dlmwrite('Graphene Photodetector_Photomap1_nA.dat', data0V);

[Star Strider]

What line is throwing the error?

If you do either whos or which with the variables you are referencing, what are the results?

Answer 1

[Titus Edelhofer]

Hi,

please use the code button to format your code. I assume the error happens at the line

rowa=scana.data(:,end);

Take a look at the variable scana. The error message suggests it is not a structure...

Titus

[saad]

Yes the error in this line. But can please explain more you suggestion

[Image Analyst]

Set a breakpoint on that line, and before that line, put these lines

scana
whos scana

don't use semicolons at the end of the line and tell us what it says in the command window.