Using "print" with no desktop?

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Marian
Marian 2014-1-17
评论： Marian 2014-1-22
I've got code that runs every hour and updates a graph. Using the print function, it creates a graph and saves it as a .jpg. However, the resolution is very low. When I run the code manually, it creates and saves the .jpg exactly as I want it. But when I am logged out (and the desktop is not available to MATLAB), the image created is poor quality. Here's my code for saving the plot:
print -djpeg birdmet.jpg -r100
drawnow
set(gcf, 'Color', 'white'); % white bckgr
I also have a .csh script to run my code, maybe it's the cause of the problem?:
#! /bin/csh
matlab -nodesktop -r "run /home/mmateling/realtime/capebird.m"
Any help would be greatly appreciated!
  2 个评论
Oliver Woodford
Oliver Woodford 2014-1-17
You haven't provided code that we can just run. However, I created a script called test.m containing
plot(rand(3));
drawnow;
print('test.jpg', '-djpeg');
and called
matlab -nodesktop -r "test"
and it worked fine, producing a sensible looking jpeg. That was on a Windows PC. What does your code run on?
Marian
Marian 2014-1-17
My code runs on Linux. It uses data that it pulls from 48 .dat files and plots them in chronological order with 4 subplots. The quality isn't awful, I would just prefer the image be larger. It creates the resolution I want (-r100) only when I am logged in, so that the desktop is accessible. When I log out (overnight), the .jpg is standard size. I've been searching the web for a way to improve the quality when run without the desktop, but to no avail.The lines I used to graph are as follows:
figure(1)
subplot(4,1,1)
plot(time,Tavg);
title(str2);
datetick('x', 'dd HH:MM');
ylabel('Temp, deg C');
print
subplot(4,1,2)
plot(time,pres,'r');
datetick('x', 'dd HH:MM');
ylabel('Pres, hPa');
print
subplot(4,1,3)
plot(time,hum,'g');
datetick('x', 'dd HH:MM');
ylabel('RH, %');
print
subplot(4,1,4)
plot(time,spd,'m');
datetick('x','dd HH:MM');
ylabel('Wnd Spd, m/s');
print
xlabel(str);

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采纳的回答

Jan
Jan 2014-1-20
Did you try to set the size of the figure explicitly?
  2 个评论
Marian
Marian 2014-1-21
I thought that was what the -r100 code in the print statement was for? Otherwise, there was no other place where the code determines figure size... is there a way to do this?
Marian
Marian 2014-1-22
Ok, I've figured out how to set the figure size and it finally worked! Thanks so much!! For anyone else reading this question: ... http://www.mathworks.com/help/matlab/creating_plots/changing-a-figures-settings.html#f3-137210 ...

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