How to extract multiple 'y' axis values with respect to 'x' axis from .fig file

hi guys,

i use this simple code to extract the 'y' axis values with respect to 'x' axis values, but it didn't work.

there are lots of individual lines in 'y' axis, that's why this code doesn't work.

Thanks in advance.

Answer 1

[Chunru]

The figure is likely produced using fplot. The appropriate object handle is of type "ImplicitFunctionLine".

f=openfig('imp.fig');

f.Children.Children

ans = 
  ImplicitFunctionLine with properties:

     Function: @(theta,h)(cosd(theta).*(sind(k.*h)).^2)-(2.*(sind(k.*h.*cosd(theta)).^2))
       XRange: [30 90]
       YRange: [0 1]
        Color: [0 0.4470 0.7410]
    LineStyle: '-'
    LineWidth: 0.5000

  Show all properties

h=findobj(f,'type','ImplicitFunctionLine')

h = 
  ImplicitFunctionLine with properties:

     Function: @(theta,h)(cosd(theta).*(sind(k.*h)).^2)-(2.*(sind(k.*h.*cosd(theta)).^2))
       XRange: [30 90]
       YRange: [0 1]
        Color: [0 0.4470 0.7410]
    LineStyle: '-'
    LineWidth: 0.5000

  Show all properties

% Retrieve the data
x=get(h,'XData');
y=get(h,'YData');


% Retrieve the function (you can obtain the data by evaluating the
% function)
fcn = h.Function

fcn = function_handle with value:
    @(theta,h)(cosd(theta).*(sind(k.*h)).^2)-(2.*(sind(k.*h.*cosd(theta)).^2))

xr = f.Children.Children.XRange

xr = 1×2

30 90

yr = f.Children.Children.YRange

yr = 1×2

0 1

figure
plot(x, y)

[Sun Heat]

The grpah is plotted using implicit fucntion. you know how to extract values of 'y' axis.

[Chunru]

See the update above.