how to build array using matlab.gra​phics.char​t.primitiv​e.Line' property

Look this example:

selected = findobj(allLines,'Type','line','LineWidth',0.5);
[cc]=selected;   

selected 13x1

xx selected 13x1

this is ok

now i try to use selected property:

selected.Color  

it give me 13x1 color!

now i try to record information in array but it's not possible

[cc]=selected.Color

now i see cc have only the first element!

can i do it?

Answer 1

[Cris LaPierre]

If I understand correctly, you want cc to just be the color of the selected lines. In that case, note that selected.Color does not return a 13x1 array, It returns 13 1x3 arrays. Try the following instead.

z = rand(10,13);
plot(z)

selected = findobj(gcf,'Type','line','LineWidth',0.5);
cc=selected

cc = 
  13×1 Line array:

  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line

cc=vertcat(selected.Color)

cc = 13×3

0.1840 0.7450 0.9370 0.2310 0.6660 0.1960 0.5210 0.0860 0.8190 0.9290 0.6940 0.1250 0.8660 0.3290 0 0.0660 0.4430 0.7450 0.8190 0.0150 0.5450 0.1840 0.7450 0.9370 0.2310 0.6660 0.1960 0.5210 0.0860 0.8190 0.9290 0.6940 0.1250 0.8660 0.3290 0 0.0660 0.4430 0.7450

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You can find a longer explanation of what is happening here: https://www.mathworks.com/matlabcentral/answers/29190-property-access-of-objects-arrays

[shamal]

thank you

but if i want to change this color and convert it as follow: (i want to add trasparency in all array)

[0.1 0.1 0.3] =====>[0.1 0.1 0.3 0.5]

[0.2 0.3 0.1] ======> [0.2 0.3 0.1 0.5]

How do you suggest I change it the fastest?

[Walter Roberson]

set(selected,  {'Color'}, cellfun(@C, [C,0.5], {selected.Color}, 'uniform', 0))

[shamal]

Unrecognized function or variable 'C'.

Error in mycallback (line 17)
set(selected,  {'Color'}, cellfun(@C, [C,0.5], {selected.Color}, 'uniform', 0));
 
Error while evaluating Line ButtonDownFcn.
(i execute it in function mycallback(o,~) )

[Walter Roberson]

z = rand(10,13);
plot(z)
selected = findobj(gcf,'Type','line','LineWidth',0.5);

set(selected,  {'Color'}, cellfun(@(C) {[C,0.5]}, {selected.Color}.'))

●

[shamal]

good...thank you.