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How can I use up and down arrow keys to scroll through my plots in MATLAB? (similar to a query on 21 Jan 2010)

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I have a similar question as asked back on Jan 21, 2010. But being a rank beginner, I couldn't understand or implement that answer. I have a large dataset of biological samples that I plot out as a graph, one sample at a time. The data are in an array with columns = sample number, and rows = measurements taken over time. I wrote a simple script to plot each sample and move forward through the dataset one sample at a time merely by hitting any key. For instance, here is my script for 10 samples measured 600 times (10 columns, 600 rows):
for k = 1:10
trace = (data(:,k));
hold on;
title(['cell # ',num2str(k),'']);
hold off;
Is there a simple way to alter this script so that I can scroll backward as well as forward?
  1 Comment
Stephen on 24 Sep 2016
I neglected to mention in the above that my biological samples are "cells", hence the title for each plot (line 5). Also, the fact that there are 600 measurements (rows) is irrelevant of course. I just put that there in the event you wanted to create your own array, "data", to test out the script

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Accepted Answer

Walter Roberson
Walter Roberson on 24 Sep 2016
Edited: Walter Roberson on 24 Sep 2016
fig = gcf;
ax = axes('Parent', fig);
max_k = 10;
k = 1;
while k <= max_k
trace = (data(:,k));
plot(ax, trace)
hold(ax, 'on');
title(ax, ['cell # ',num2str(k),'']);
hold(ax, 'off');
was_a_key = waitforbuttonpress;
if was_a_key && strcmp(get(fig, 'CurrentKey'), 'uparrow')
k = k - 1;
k = k + 1;
Walter Roberson
Walter Roberson on 25 Sep 2016
CurrentKey is the trick there. But for future you should look at figure keypressfcn and windowkeypressfcn callback

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