Function figure has the same name as a MATLAB builtin mistake

I wrote the code as following:

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att_phi = figure('Name','attitude X axis','NumberTitle','off');

stairs(sim_eul.time, sim_eul.signals.values(:,1),'color','r','LineWidth',2);

hold on

stairs(att_obs_attitude.time,att_obs_attitude.signals.values(:,1),'color','b','LineWidth',2);

hold off

title('phi angle ','fontsize',fontsizeT)

legend('simulated','estimated')

ylabel('Angle [rad]','fontsize',fontsize)

xlabel('Time [s]','fontsize',fontsize)

grid on

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Mistake message : 'Name' is an invalid option

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Matlab version: Matlab 2014b

Problem:

1. Why is the property name wrong?

2. Is there anything wrong inside that piece of code?

Thx.

Jiawei

Answer 1

[Andreas Goser]

I do not think you do something wrong. When I execute with reasonable data, it runs through:

att_phi = figure('Name','attitude X axis','NumberTitle','off');

sim_eul.time=[1 2 3 4];
att_obs_attitude.time=sim_eul.time;
sim_eul.signals.values=[1 2 3 4;1 2 3 4]';
att_obs_attitude.signals.values=sim_eul.signals.values;
fontsizeT=12;
fontsize=12;

stairs(sim_eul.time, sim_eul.signals.values(:,1),'color','r','LineWidth',2);
hold on
stairs(att_obs_attitude.time,att_obs_attitude.signals.values(:,1),'color','b','LineWidth',2);
hold off
title('phi angle ','fontsize',fontsizeT)
legend('simulated','estimated')
ylabel('Angle [rad]','fontsize',fontsize)
xlabel('Time [s]','fontsize',fontsize)
grid on

[Andreas Goser]

Can you debug further? In which line does the error occur?

[JIAWEI WU]

thank you for your test.

The error occur on the first line:

att_phi = figure('Name','attitude X axis','NumberTitle','off');

It indicates that 'Name' is invalid, I also execute this piece code in 2014a, it works

[Andreas Goser]

What does

which name -all

return for you?

[JIAWEI WU]

Oh, i am so sorry, my colleague has already helped me replace the version 2014b to 2014a after the fact that he also can't solve the problem. But i will attach the message obtained after execute 'which name -all' from my pc at home later. Because i am using 2014b on my personal pc.

Thx anyway.

Answer 2

[John D'Errico]

You both seem to be focusing on the idea of Name as a function. That does not seem to be indicated by your comments, nor by the error message you got.

The title of your post is "Function figure has the same name as a MATLAB builtin mistake".

That suggests to me that you have written a function whos name is figure.m, and put it on your search path. That it works on a different release merely indicates you did not port over this spurious figure.m function to the alternate release.

So my question would be to ask what you get from

which figure -all

If you created your own figure function, then it would overload the built-in figure, and cause the error you indicate.

[JIAWEI WU]

Thanks for your reply.

in fact, there is no particular function sounds like 'figure.m', i guess it indicates the system function 'figure(property name, value....)'.

By the way, even I only execute command 'figure('Name','nothing')', it will also propose the message: 'Name' is invalid option. and warning like, there is conflict with system built-in function while using 'figure('Name',....)'.

[Andreas Goser]

As opposed to me, John read carefully the title line. But in both cases, it would help to execute the "which" command instead of just claiming there is no "figure.m". What abould "figure" for a P file? A variable? Etc.