why The name 'Parent' is not an accessible property for an instance of class 'matlab.gr​aphics.Gra​phicsPlace​holder'?

I try to use hgtransform like this tutorial(Create transform object - MATLAB hgtransform (mathworks.com) but my matlab doesn't run properly. It's always tell me that The name 'Parent' is not an accessible property for an instance of class 'matlab.graphics.GraphicsPlaceholder'.

Answer 1

[Walter Roberson]

Put a breakpoint in at the begining of the sequence of statements where h() is assigned to, the series

h(1) = surface(x,y,z,'FaceColor','red');
h(2) = surface(x,y,-z,'FaceColor','green');
h(3) = surface(z,x,y,'FaceColor','blue');
h(4) = surface(-z,x,y,'FaceColor','cyan');
h(5) = surface(y,z,x,'FaceColor','magenta');
h(6) = surface(y,-z,x,'FaceColor','yellow');

Use the debugger to dbstep to execute one of the lines at a time. Examine the h vector afterwards. Do all of the entries in h show up as GraphicsPlaceholder ? Do some of the entries in h show up as GraphicsPlaceholder ? If so, after the h(6) assignment, which entries in h are GraphicsPlaceholder ?

What shows up for the command

which -all surface

[saran saenaubon]

I'm not sure that I exactly understand what you say. I put break point above line6 and step each line, line6-11 can run properly and show GraphicsPlaceholder but error happen on line13

[Walter Roberson]

The output of surface() should not show GraphicsPlaceholder

Please show the output of

which -all surface

Also, experiment by running

restoredefaultpath; rehash toolboxcache

and then running your code again. If that suddenly works, then you have some third-party function in your path that is interfering.

[saran saenaubon]

after I run step by step, "The name 'Parent' is not an accessible property for an instance of class 'matlab.graphics.GraphicsPlaceholder'" this happend in line 18

[Walter Roberson]

surface() should not be returning GraphicsPlaceholder, not even once.

When you call surface() in that form, it should always be adding to the axes, even if hold is not on

The message you were getting with deleted object suggests that your calls to surface() are deleting the existing objects -- which is not supposed to happen.

What shows up if you ask

ls *.m
ls *.p

I have a suspicion that something in your MATLAB path is interfering with the normal graphics operations.

[saran saenaubon]

Did it happend becuase I try to use GraphicsPlaceholder in other area at the same time?

[Walter Roberson]

What do you get if you try the following at the command line ?

h1 = surface()
h2 = surface()

[saran saenaubon]

now it's run properly after I change other surface name (I use h as surface name previously). Why is it that?e