Setting LineWith property for all lines by point-notation

Question

Udo Kessler 2016-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/312995-setting-linewith-property-for-all-lines-by-point-notation

评论： Walter Roberson 2016-11-20

Hi,

Why can't the LineWidth property be set by point notation (for all Children of an axes object at once)? As far as i know, this worked in some earlier version - but i'm not sure about this. I'm using Matlab R2016b.

Example:

 y = rand(10, 3);
 x = 1:10;
 hAx = axes();
 plot(hAx, x, y);
 %hAx.Children.LineWidth = 5; % <-- this won't work
 set(hAx.Children, 'LineWidth', 5) % ..but this

Then again, this will work (for line 1):

hAx.Children(1).LineWidth = 3;

Children is a array (of lines), so setting all its values by a scalar should be possible(?)

The errormessage is: Expected one output from a curly brace or dot indexing expression, but there were 3 results.

Greetings and thanks in advance!

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Answer 1

Udo Kessler 2016-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/312995-setting-linewith-property-for-all-lines-by-point-notation#answer_243916

编辑：Udo Kessler 2016-11-19

在 MATLAB Online 中打开

Thank you, yes, your code works. My understanding in Matlab types, fields, cells ..and so on (and how to operate with them) is too small, i think - i hope my english is a litte better :) I have to learn more about all those things before going on.

Calling the LineWidth field brings 3 single answers, instead of an array (what i thought).

 hAx.Children.LineWidth
 ans =
    0.5000
 ans =
    0.5000
 ans =
    0.5000

Edit: hAx.Children is a array of handles to graphic objects (Lines). Those Line-Objects each have a field LineWidth - and those are returned singly when using hAx.Children.LineWidth. Therefore i get 3 answers. Is that correct? And also therefore i cannot simple set them all at once by assigning a value to that structure field ..LineWidth ?