Plotting negative values on an histogram

I am plotting some values on an histogram.

figure
histogram('Categories',Categories,'BinCounts',[-72 -63 -54 -56],'BarWidth',0.5,'FaceColor','#EDB120')
xlabel('Membrane potential');
ylabel('Rest Memb Pot (mV)');
title('Amplitude of AP');

The problem is that whenever one of the values for BinCounts is negative, I get this error:

Error using histogram (line 156)
Expected input number 4, BinCounts, to be nonnegative.

While everything works perfectly if the values are all positive.

Answer 1

[Image Analyst]

Or maybe that's the data??? It doesn't make sense to have a negative count. If you want bars that go negative, use bar() not histogram().

Answer 2

[Bjorn Gustavsson]

It seems likely that you've mixed up BinCounts and BinEdges - it doesn't make much sense to have a negative number of something in a bin (perhaps in economics if we're talking about debts?).

HTH