MATLAB: Plotting very small and large values on same figure.

plot

Hi, I have one question. I have set of data column wise. Actually two columns are there. Problem is that 1 column contain very small values in decimals like 0.00001 etc where the other column has comparatively large values. I want to analyze this data through plotting.

Can anybody please suggest me which plot type like bar, scatter or plot is better here??? I would be very thankful to you.

Best Answer

Look at

doc yyaxis

to put the two on separate axes that will cover range of each variable independently for starters, at least....

ADDENDUM POST PLAINTIVE COMMENT ABOVE :)

If y is the data array, then

yyaxis left
bar([y(:,1) nan(size(y,1),1)],'grouped')
yyaxis right
bar([ nan(size(y,1),1) y(:,2)],'grouped')

This uses feature of most basic plotting routines in ML that NaN data are silently ignored; so you draw a 'grouped' bar plot on LH axes with the first column of data but NaN as placeholder for second and vice versa on RH axes.

Should be a higher-level way to tell yyaxis/bar together this is what you're trying to achieve without having to do it directly oneself, but "it is what it is" at present.

Related Solutions

MATLAB: Create grouped bar chart using figure handle

I don't know what you mean by figure handles. However, when you call the bar function mutliple times the outputs are independent of one another and thus become stacked like in your example. What you can do to avoid this is to pad the data with nans.

ax = subplot(1, 2, 2);
hold(ax, 'on')
bar(ax, x, [y1;nan(size(y1))]', 'grouped');
bar(ax, x, [nan(size(y2));y2]', 'grouped');
xlabel('B')

MATLAB: Bar Plot with 2 Y axes and same X- axis

Since the two calls to bar in plotyy are independent of each other, there's no way for the information that you want two independent bar plots to look like together they're grouped. Fortunately, there's a relatively simple way to fake it -- will just use a trivial example rather than try to explain; the "trick" should be self-evident.

N=5;                             % number of bars
y1=rand(N,2); y2=100*rand(N,2);  % dummy disparate-magnitude data sets 
y1(:,2)=nan;y2(:,1)=nan;         % NB: column 2, then column 1 are set NaN
x=[1:N].';                       % use the serial index to plot against
hAx=plotyy(x,y1,x,y2,@bar,@bar); % plot, save axes handles
set(hAx(2),'xtick',[])           % turn off labels on RH x-axis; keep only one set
set(hAx(1),'xticklabel',[200:100:500 700]) % tick labels on first...

Well, I'll try to add some explanatory words too, despite the promise... :)

The "trick" is to make the data arrays the number of columns wide that you need grouped bars (here, two, one for each y-axis); it's over columns that Matlab 'group' works. All the HG plot routines have the feature that NaN is handled gracefully simply by not being plotted but the place holder is still there. Hence, as above, there are two bars for each plot but by swapping which column is NaN, one is drawn left, the other right of center and voila! you've got the appearance of 'group' with disparate bar graphs...

Salt to suit with your own data, of course.

Best Answer

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MATLAB: Create grouped bar chart using figure handle

MATLAB: Bar Plot with 2 Y axes and same X- axis

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