# Subplot Position Calculator 1

Posted by **Jiro Doke**,

Jiro‘s pick this week is Subplot Position Calculator by Christopher Hummersone.

`subplot` is a nice way to place a grid of axes on a single figure. But the spacing is sometimes a bit too generous, leaving too little room for the graph.

nRows = 3; nCols = 2; for m = 1:nRows for n = 1:nCols subplot(nRows,nCols,(m-1)*nCols+n) plot(rand(20,1)) end end

In that case, you can use `axes` or `subplot` to specify the actual placement of the axes.

figure subplot('position',[0.05 0.1 0.45 0.8]) plot(rand(20,1)) subplot('position',[0.55 0.1 0.4 0.8]) plot(rand(20,1))

But this defeats the purpose of `subplot` because you have to calculate and specify the position manually. This is where Christopher’s entry comes in handy. It lets you specify the grid layout, with optional parameters, and it returns a set of position vectors which you can feed into `subplot` or `axes`.

The default is a tight layout with no margin.

pos = iosr.figures.subfigrid(nRows,nCols); figure for m = 1:nRows for n = 1:nCols subplot('Position',pos(m,:,n)) plot(rand(20,1)) end end

You can specify the spacing and the scaling by passing in a couple of optional arguments.

pos = iosr.figures.subfigrid(nRows,nCols,[0.1 0.05 0.05 0.1],[.95 .95]); figure for m = 1:nRows for n = 1:nCols subplot('Position',pos(m,:,n)) plot(rand(20,1)) end end

As some of you may have guessed, his function is part of a package (IoSR Matlab Toolbox), and the other functionalities are also highlighted in his other File Exchange entries.

In addition to the usefulness of this function, I like Christopher’s entry because it is well-written with plenty of error-checking and has good help with examples. I haven’t had a chance to check out his other functions in his toolbox, but I would expect the same kind of quality as seen in this one.

**Comments**

Give it a try and let us know what you think here or leave a comment for Christopher.

Get the MATLAB code

Published with MATLAB® R2017a

**Category:**- Picks

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## 1 CommentsOldest to Newest

**1**of 1

Yet another PotW dealing with subplot. I think the full functionality of subfigrid is actually contained in subplot, if TMW would just exposed the hard coded “inset” parameter through either the figure properties or the appdata of the figure. I mentioned that I have an enhancement request the last time you picked a subplot FEX submission (http://blogs.mathworks.com/pick/2012/12/21/figure-margins-subplot-spacings-and-more/?s_tid=srchtitle#comment-17796). Maybe someday TMW will improve subplot.

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