MATLAB Answers

Plotting from a loop in a live script in Matlab 2016b

63 views (last 30 days)
Olaf Bousche
Olaf Bousche on 19 Jan 2017
Edited: Adam Wyatt on 18 Apr 2019
I want to plot and write text fro a loop in a live script. Unfortunately this puts all the text at the top and charts at the bottom. Does anyone know how to fix this?
for j = 1:3
figure
plot(1:10,j*ones(1,10))
drawnow
grid on
title(sprintf('This is plot %d',j))
fprintf('This is the text for plot %d\n',j)
drawnow
end
I have attached the live script for testing.
  1 Comment
Nirav Sharda
Nirav Sharda on 24 Jan 2017
This is a current limitation of the live editor. I work for MathWorks and have provided this feedback to the development team. Currently there are no known workarounds for this.

Sign in to comment.

Answers (1)

Adam Wyatt
Adam Wyatt on 25 Oct 2017
Edited: Adam Wyatt on 18 Apr 2019
There is a slight workaround, which works in version 2017b (no need to manually create the axes, replace this and the title line with your own figure code, may or may not be necessary to clear the figure):
for n=1:3
fig = figure;
clf(fig);
axes;
title(n);
end
for n=10:12
fig = figure;
clf(fig);
axes;
title(n);
end
Note: Figures in the live editor work as follows: Matlab automatically creates a hidden figure window (i.e. a figure window with its visibility property set to false). By default, each plot is created in the current hidden figure window - overwriting or adding to existing plots according to the default properties of the command in question (e.g. plot will create a new axes, whereas line will draw a line in the current axes, unless hold is on). After all plotting commands are complete, Matlab will export the figure to a bitmap and then insert this figure into the live editor (which is just an HTML parser).
Understanding this process should help understand how to implement your requirements. For example, you can resize the figure window, thus changing the size of the image imported into the document.
Note that an "excessive" amount of figures (particularly large figures) will dramatically slow down the interface. There are pros and cons of live scripts and unfortunately Mathworks haven't quite got it to the stage that they are the optimum solution in the majority of scenarios.
  3 Comments
Olaf Bousche
Olaf Bousche on 15 Nov 2018
Adam,
Thanks for reminding me. The live scripts have been significantly improved since they were introduced. In 2018b my original script shown at the top:
for j = 1:3
figure
plot(1:10,j*ones(1,10))
drawnow
grid on
title(sprintf('This is plot %d',j))
fprintf('This is the text for plot %d\n',j)
drawnow
end
works as it should! It took a few versions but now things are working as intended.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!