为什么轴在Matlab循环中被删除? [英] Why axes handle deleted in Matlab loop?
问题描述
试图模拟真实动态条件的代码
Code which tries to mimic the real dynamic condition
clear all; close all;
hFig2=figure('Units','inches', 'Name', 'Time');
hax2=axes(hFig2);
movegui(hFig2, 'southeast');
index=1;
while (index < 7);
hFig2=figure(hFig2);
u=0:0.01:1+index;
plot(hax2, u); % Give columns 1xXYZ to Matlab
hold on;
axis(hax2, 'xy');
axis(hax2, [0 (size(u,2)/1 - 0) min(u) max(u)]); % to maximise size
axis(hax2, 'off'); % no ticks
index=index+1;
pause(1);
hold off;
drawnow
end;
在更动态的条件下登录1 hax2
日志2 hax2
主要在代码
Logs 1 hax2
in more dynamic condition,
Logs 2 hax2
mostly in Code
%% Logs 1 in dynamic condition with failure output
% Failure in more dynamic conditions because axes get deleted for some reason
% hax2
%
% hax2 =
%
% handle to deleted Axes
%
%% Logs 2 mostly in Code condition and correct because
% hax2 =
%
% Axes with properties:
%
% XLim: [0 201]
% YLim: [0 2]
% XScale: 'linear'
% YScale: 'linear'
% GridLineStyle: '-'
% Position: [0.1300 0.1100 0.7750 0.8150]
% Units: 'normalized'
由于某些原因 c
$ b
Error if failure in hax2
i.e. handle to deleted axes
for some reason
%% Failure message
% Show all properties
%
% Warning: MATLAB has disabled some advanced graphics rendering features by switching to software OpenGL. For more information, click
% here.
% Error using plot
% Invalid handle.
%
% Error in test_invalid_handle (line 12)
% plot(hax2, u);
解决方案的一些暂定提案
Some tentative proposals of solutions
- 在每个循环的末尾保存
轴
句柄;可能的相关线程在MATLAB中绘制时保存轴手柄 - ...
-
- Save the
axes
handle at the end of each loop; possible related thread Save axes handle when plotting In MATLAB - ...
操作系统:Debian 8.5 64位
Matlab:2016a
硬件:华硕Zenbook UX303UA < br>
Linux内核:4.6的backports
OS: Debian 8.5 64 bit
Matlab: 2016a
Hardware: Asus Zenbook UX303UA
Linux kernel: 4.6 of backports
推荐答案
调用轴
,第一个输入应该是一个指定父对象的参数/值对。如果你传递一个单独的句柄图形输入,它假设输入是轴的句柄
When calling axes
, the first input should be a parameter/value pair that specifies the parent. If you pass it a single handle graphics input it assumes that input is a handle to an axes
axes(hFig2)
% Error using axes
% Invalid axes handle
或正如你所写的
hax2 = axes(hFig2);
% Error using axes
% Too many output arguments.
因为您传递无效的轴
句柄对它,它没有正确地将句柄分配给新的轴
到 hax2
。您可能已经从脚本的以前的 运行中删除了您所看到的 hax2
。
Because you are passing an invalid axes
handle to it, it doesn't properly assign the handle to a new axes
to hax2
. It is likely that your deleted hax2
that you're seeing is from a previous run of the script.
相反,您需要使用参数/值对来指定轴的
。父
属性
Instead, you'll want to use parameter/value pairs to specify the Parent
property of the axes
.
hax2 = axes('Parent', hFig2);
此外,我将删除无关调用 figure
每次通过循环,因为您明确指定了每个绘图对象的父对象
Also, I would remove the extraneous call to figure
every time through the loop since you explicitly specify the parent object of each plot object
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