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heatmap function doesn't work (Error in heatmap (line 138))

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bryan flood
bryan flood 2019-5-7
编辑： Adam Danz 2019-5-7
I'm trying to use the heatmap function. I can't get it to work. I can't even get the example from the mathworks website to work:
cdata = [45 60 32; 43 54 76; 32 94 68; 23 95 58];
h = heatmap(cdata);
which returns:
Not enough input arguments.
(Error in heatmap (line 138)
[h3, Centers] = hist3([x1, x2], nbins) ;
I don't know how I can figure out what's wrong with my code, if the example doesn't even work. Any help would be appreciated.
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Star Strider
Star Strider 2019-5-7
Leave the ones that are subdirectories of: C:\Program Files\MATLAB\R2019a\toolbox\matlab\.
I would just slightly rename the one you downloaded from the File Exchange, so that it doesn’t overshadow the built-in MATLAB functions. Removimg it completely is unnecessary. It may have features you want.
Steven Lord
Steven Lord 2019-5-7
Leave them both.
The one in the @tall directory is the heatmap method used when you try to create a heatmap plot with a tall array as input.
The one in the specgraph directory is the heatmap function used when you try to create a heatmap plot with normal double precision or table data.

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Adam Danz
Adam Danz 2019-5-7
编辑：Adam Danz 2019-5-7
The problem was caused by a file named heatmap.m that overshadowed Matlab's built-in function of the same name. This was discovered after listing all files on path that had the name heatmap.
which heatmap -all
In r2019a (and presumably other recent releases) two files are listed that are associated with Matlab's heatmap() function.
C:\Program Files\MATLAB\R2019a\toolbox\matlab\specgraph\heatmap.m
C:\Program Files\MATLAB\R2019a\toolbox\matlab\bigdata\@tall\heatmap.m % tall method
The second one is used with tall arrays.

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