Exceeds the number of array elements (0).

Hi everyone,

I have got the error in the code below, What should I do to fix it?

Code

% convert finite values to indices between 1 and map length
n = size(map, 1);
inds = (img(valid)-bounds(1))/(bounds(end)-bounds(1))*(n-1);
inds = floor(min(max(inds, 0), n-1))+1;

Error

Index exceeds the number of array elements (0).

Error in double2rgb (line 44)
ins = (img(valid)-bounds(1))/(bounds(end)-bounds(1))*(n-1);

Answer 1

[Voss]

Either img or bounds (or both) is empty.

Check img and bounds and figure out why one or both is not what you expect.

[Neda Deljavan]

"img" and "bounds" are in the function "double2rgb.m" that I used in my code.

COPYRIGHT code removed. Please do not post copyright code on this forum. Original source:

https://www.mathworks.com/matlabcentral/fileexchange/30264-double2rgb

I got the error in using the above function in my code below:

Code:

%Rescaling network features for plotting networks
grafo = graph(W);                                           % converting matrix to graph list of edges
links = table2array(grafo.Edges);                           % converting the graph object into a table
wij = links(:,3);                                           % taking only link weigths

a = 1;            b = 10;                                    % range for rescaling limits
wij = ( (wij - min(wij)).*(b-a) )/(max(wij) - min(wij));    % rescaling formula
wij = wij+0.5;
rgb = squeeze(double2rgb(wij, colormap(jet))); close        % mapping values to RGB colors with pallete JET

a = 1;            b = 10;                                    % range for rescaling limits
wij = ( (wij - min(wij)).*(b-a) )/(max(wij) - min(wij));    % rescaling formula
wij = wij+0.5;

So, I could not deal with the error. Please help me.

Thanks in advance.

[Voss]

Like I said, if img is empty, then you'll get the error you got.

Maybe wij is empty because links has zero rows. I don't know because I don't have your data. You'll have to check on that.

[Neda Deljavan]

Yes, you are right. wij is NaN. What should I do?

I will display codes before wij step by step below:

grafo = graph(W);  

links = table2array(grafo.Edges);  

wij = links(:,3);

a = 1;            b = 10;                                    % range for rescaling limits
wij = ( (wij - min(wij)).*(b-a) )/(max(wij) - min(wij));    % rescaling formula
wij = wij+0.5;

So, due to this NaN, rgb does not run:

rgb = squeeze(double2rgb(wij, colormap(jet)));

What should I do? Thanks in advance for your help.

[Walter Roberson]

Do not use double2rgb(). Use

rgb = ind2rgb(uint8(rescale(wij, 0, 255)), jet);

[Neda Deljavan]

Yesss. It solved :) Thanksss a billion.

Also, I add 0.01 in the denominator of wij and it works:

wij = ( (wij - min(wij)).*(b-a) )/((max(wij) - min(wij))+0.01);

[Neda Deljavan]

Due to wij is NaN.

I fixed the problem of wij, but I got the error in the next step which is:

Code:

%%  step24: Plotting a Functional Network
figure
hold on;
% ind=find(isnan(wij));
% wij(ind)=0.01;
for ll = 1 : length(links)  %% plotting links
    line([EEG.chanlocs(links(ll,1)).X, EEG.chanlocs(links(ll,2)).X], [EEG.chanlocs(links(ll,1)).Y, EEG.chanlocs(links(ll,2)).Y], 'LineWidth', wij(ll), 'Color', rgb(ll,:) );
end
colormap(jet);
% colorbar
for nn = 1 : 4             %% plotting nodes
    plot(EEG.chanlocs(nn).X, EEG.chanlocs(nn).Y, 'ro', 'MarkerSize', st(nn), 'MarkerFaceColor', 'y')
    text(EEG.chanlocs(nn).X+0.5, EEG.chanlocs(nn).Y, EEG.chanlocs(nn).labels, 'FontSize', 11);
end
view([270 90]);             %% rotating to vertical view
axis equal; axis off;
set(gcf, 'units','normalized','outerposition',[0 0 1 1]) %EXPANDING FIGURE ON SCREEN

Error:

Index in position 1 exceeds array bounds (must not exceed 1).

Error in NEW1 (line 452)
line([EEG.chanlocs(links(ll,1)).X, EEG.chanlocs(links(ll,2)).X], [EEG.chanlocs(links(ll,1)).Y, EEG.chanlocs(links(ll,2)).Y], 'LineWidth', wij(ll),
'Color', rgb(ll,:) );

[Walter Roberson]

We do not have your current code, and we do not have your data to test with.

As outside observers, we have no reason to expect that EEG.chanlocs is not (for example) a transfer function that does not have an X field at all. Or maybe EEG is a graph() object that you added a chanlocs property to. We have no way of knowing.

[Neda Deljavan]

After the section above, for running code below I've got an error, what's the problem?

Code:

for ll = 1 : length(links)  %% plotting links
    line([EEG.chanlocs(links(ll,1)).X, EEG.chanlocs(links(ll,2)).X], [EEG.chanlocs(links(ll,1)).Y, EEG.chanlocs(links(ll,2)).Y], 'LineWidth', wij(ll), 'Color', rgb(ll,:) );
end
colormap(jet);
% colorbar
for nn = 1 : 4             %% plotting nodes
    plot(EEG.chanlocs(nn).X, EEG.chanlocs(nn).Y, 'ro', 'MarkerSize', st(nn), 'MarkerFaceColor', 'y')
    text(EEG.chanlocs(nn).X+0.5, EEG.chanlocs(nn).Y, EEG.chanlocs(nn).labels, 'FontSize', 11);
end
view([270 90]);             %% rotating to vertical view
axis equal; axis off;
set(gcf, 'units','normalized','outerposition',[0 0 1 1]) %EXPANDING FIGURE ON SCREEN

Error:

Error using line
Value should be a finite number greater than 0

Error in NEW1 (line 452)
line([EEG.chanlocs(links(ll,1)).X, EEG.chanlocs(links(ll,2)).X], [EEG.chanlocs(links(ll,1)).Y, EEG.chanlocs(links(ll,2)).Y], 'LineWidth', wij(ll),
'Color', rgb(ll,:) );

Thanks in advance for your help.

Bests,

Neda

[Voss]

My guess is that wij(ll) is NaN or Inf or a non-positive number.

You can see below that those cases throw the error you got:

try
    line([1 2],[1 2],'LineWidth',NaN)
catch e
    delete(gca())
    disp(e.message);
end

Value should be a finite number greater than 0

try
    line([1 2],[1 2],'LineWidth',Inf)
catch e
    delete(gca())
    disp(e.message);
end

Value should be a finite number greater than 0

try
    line([1 2],[1 2],'LineWidth',0)
catch e
    delete(gca())
    disp(e.message);
end

Value should be a finite number greater than 0

try
    line([1 2],[1 2],'LineWidth',-1)
catch e
    delete(gca())
    disp(e.message);
end

Value should be a finite number greater than 0