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Hello!

I am still struggling with trying to make graphs with categorical variables and error bars.

I am getting an error in line 11 (starts with ctr) that says "Unable to perform assignment because the left side is 1-by-3 and the right side is 1-by-2".

Am I missing a blatant 1-by-3 vector and how do I fix it without ruining my code? I apprieciate any help I can get, as I started learning Matlab just this year. Thanks!!

Here is my current code:

xc = categorical({'PTSD-','PTSD+'});

x = 1:numel(xc);

y = [.09 .13 ; -.08 -.35];

hBar = bar(x,y);

pos = [.1 .15 .2 .21];

neg = pos

posr = reshape(pos, 2, [2]);

negr = reshape(neg, 2, [2]);

for k1 = 1:size(y,2)

ctr(k1,:) = bsxfun(@plus, 1:numel(hBar(k1).XData), hBar(k1).XOffset');

ydt(k1,:) = hBar(k1).YData;

end

set(gca, 'XTick',x, 'XTickLabel',xc,'FontSize',12, 'FontName', 'Helvetica')

ylabel("Overall Cognitive Functioning (Z-Score)", 'FontSize',12, 'FontName', 'Helvetica')

ylim([-.5 .5]);

yticks([-.5, -.4 -.3 -.2 -.1 0 .1 .2 .3 .4 .5])

legend('location','northeast')

legend('FontName', 'Helvetica', 'FontSize',12)

legend boxoff

box off

legend boxoff

newcolors = ['#CBCBCB'; '#0033A0']

colororder(newcolors)

legend({'Met-','Met+'})

set(gca, 'XTick',x, 'XTickLabel',xc,'FontSize',12, 'FontName', 'Helvetica')

Star Strider
on 21 Oct 2020

I’m not certain what you’re doing with that line.

The standard way of coding it (to put errorbar objects or text objects at the top of the bars) is:

ctr(k1,:) = bsxfun(@plus, hBar(k1).XData, hBar(k1).XOffset')

I suspect that diference could be the problem, however I find it a bit difficult to follow your code, because I don’t see that you use ‘ctr’ or ‘ydt’ anywhere else.

Star Strider
on 21 Oct 2020

You may have used the same block of code earlier, and set ‘ctr’ to a different size. The only fix for that I can think of is to re-define ‘ctr’ and ’ydt’ before the loop. The only other problem I can see is that the loop should be defined by ‘size(y,1)’ to make it appropriatlely general (although with a square matrix, that problem would not be evident).

Try this:

xc = categorical({'PTSD-','PTSD+'});

x = 1:numel(xc);

x = 1:2;

y = [.09 .13 ; -.08 -.35];

hBar = bar(x,y);

pos = [.1 .15 .2 .21];

neg = pos;

posr = reshape(pos, 2, [2]);

negr = reshape(neg, 2, [2]);

ctr = zeros(size(y)); % <— ADD THIS PREALLOCATION

ydt = zeros(size(y)); % <— ADD THIS PREALLOCATION

for k1 = 1:size(y,1)

ctr(k1,:) = bsxfun(@plus, hBar(k1).XData, hBar(k1).XOffset'); % Note: ‘XOffset’ Is An Undocumented Feature, This Selects The ‘bar’ Centres

ydt(k1,:) = hBar(k1).YData; % Individual Bar Heights

end

If my diagnosis is correct, the preallocations should be the cure!

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