Why does this axes handle become invalid
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I'm given the error message "Invalid object handle" from the following line of code: set(mainWindow, 'CurrentAxes', nodePlotAxes). mainWindow is the figure window containing my GUI, and nodePlotAxes is one of two axes in the GUI. I've narrowed the problem down to the section of code at the bottom of the post. I'm pretty confident this is where the problem is because of the four disp(ishandle()) commands. Somewhere in between them the nodePlotAxes loses its status as a handle. Any help is much appreciated. Also, the GUI is created programatically, not using GUIDE, if that makes a difference.
disp(ishandle(mainWindow));
disp(ishandle(nodePlotAxes));
set(mainWindow, 'CurrentAxes', nodePlotAxes); % Error not here, same command in a pushbutton
subplot(2, 1, 1)
hold on
plot(userData.result.time, userData.result.state.infected(userData.chosenNode,...
:), '--r', 'LineWidth', 3)
plot(userData.result.time, userData.result.state.susceptible(userData.chosenNode,...
:), '-b', 'LineWidth', 3)
hold off
grid
axis([0 length(userData.result.time)-1 0 1])
xlabel('Time')
ylabel('State Probabilities')
title(sprintf('Temporal Evolution of State Probabilities for Node %d', userData.chosenNode))
legend('Infected', 'Susceptible')
subplot(2, 2, 3)
hold on
plot(userData.result.time, userData.result.trans.pSS(userData.chosenNode,...
:), '-b', 'LineWidth', 3)
plot(userData.result.time, userData.result.trans.pSI(userData.chosenNode,...
:), '-r', 'LineWidth', 3)
hold off
grid
axis([0 length(userData.result.time)-1 0 1])
xlabel('Time')
ylabel('Probability')
title('Susceptible Transition Probabilities as a Function of Time')
legend('P_S_S', 'P_S_I')
subplot(2, 2, 4)
hold on
plot(userData.result.time, userData.result.trans.pIS(userData.chosenNode,...
:), '--b', 'LineWidth', 3)
plot(userData.result.time, userData.result.trans.pII(userData.chosenNode,...
:), '--r', 'LineWidth', 3)
hold off
grid
axis([0 length(userData.result.time)-1 0 1])
xlabel('Time')
ylabel('Probability')
title('Infected Transition Probabilities as a Function of Time')
legend('P_I_S', 'P_I_I')
disp(ishandle(mainWindow));
disp(ishandle(nodePlotAxes));
2 个评论
Jan
2015-4-24
Why do you assume that the problem is in the lower part of the code, when the 3rd line fails?
回答(2 个)
Sean de Wolski
2015-4-24
My guess (since the whole thing won't run) is:
subplot(2, 1, 1)
Draws a new axes and erases the old.
5 个评论
makr9962
2017-10-18
I guess i have the exact same problem. The after the first subplot command
disp(ishandle())
is 0. After more than two years, has anyone a solution?
Steven Lord
2017-10-18
The subplot calls are in fact the cause of this behavior. Use axes instead of subplot. From the Tips section of the documentation for the subplot function:
"To overlay axes, use the axes command instead. The subplot function deletes existing axes that overlap new axes. For example, subplot('Position',[.35 .35 .3 .3]) deletes any underlying axes, but axes('Position',[.35 .35 .3 .3]) positions new axes in the middle of the figure without deleting underlying axes."
I added the emphasis on the key sentence in that quote.
0 个评论
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