Extract data points from a plot corresponding to the plot legend

I am trying to determine how to extract the data file from the plot.

Data has to correspond with the correct plot. Please help.

open('ExampleData.fig')

Answer 1

[Les Beckham]

fig = openfig('ExampleData.fig'); % open and get a handle to the figure

% get(fig);
ax = get(fig, 'CurrentAxes'); % get handle to the axis in the figure
% get(ax);
lines = get(ax, 'Children'); % get handles to the lines which are children of the axis
% get(lines(1));
for i = 1:numel(lines) % extract the data from each of the lines
    xdata{i} = lines(i).XData;
    ydata{i} = lines(i).YData;
    names{i} = lines(i).DisplayName;
end
names' % display the names to verify that they are in the right order (per the legend)

ans = 6×1 cell array
    {'0° Pre Thermal Dec' }
    {'45°Pre Thermal Dec' }
    {'90°Pre Thermal Dec' }
    {'90°Post Thermal Dec'}
    {'45°Post Thermal Dec'}
    {'0°Post Thermal Dec' }

% looks like they aren't, create a new index vector to re-arrange them
idx = [6 5 4 3 2 1];
xdata = xdata(idx); % note regular parentheses here
ydata = ydata(idx);
names = names(idx);
names'  % display the re-arranged names to verify that they are NOW in the right order (per the legend)

ans = 6×1 cell array
    {'0°Post Thermal Dec' }
    {'45°Post Thermal Dec'}
    {'90°Post Thermal Dec'}
    {'90°Pre Thermal Dec' }
    {'45°Pre Thermal Dec' }
    {'0° Pre Thermal Dec' }

% whos

Answer 2

[Voss]

Here's one way:

f = openfig('ExampleData.fig');

lines = findall(f,'Type','line')

lines = 
  6×1 Line array:

  Line    (0° Pre Thermal Dec)
  Line    (45°Pre Thermal Dec)
  Line    (90°Pre Thermal Dec)
  Line    (90°Post Thermal Dec)
  Line    (45°Post Thermal Dec)
  Line    (0°Post Thermal Dec)

line_props = cell(1,numel(lines));
for ii = 1:numel(lines)
    line_props{ii} = get(lines(ii));
end
line_props = [line_props{:}];

line_props

line_props = 1×6 struct array with fields:
    XData
    XDataMode
    XVariable
    YData
    YDataMode
    YVariable
    ZData
    ZDataMode
    ZVariable
    XDataSource
    YDataSource
    ZDataSource
    Color
    ColorMode
    LineStyle
    LineStyleMode
    LineWidth
    Marker
    MarkerMode
    MarkerSize
    MarkerEdgeColor
    MarkerFaceColor
    Clipping
    MarkerIndices
    AlignVertexCenters
    LineJoin
    Children
    Parent
    Visible
    HandleVisibility
    ButtonDownFcn
    ContextMenu
    BusyAction
    BeingDeleted
    Interruptible
    CreateFcn
    DeleteFcn
    Type
    Tag
    UserData
    Selected
    SelectionHighlight
    HitTest
    PickableParts
    DisplayName
    Annotation
    SeriesIndex
    DataTipTemplate
    SourceTable

Now you can use line_props to get whatever information about the lines you need.

For example, to get the XData and YData of the '90°Post Thermal Dec' line:

idx = find(strcmp({line_props.DisplayName},'90°Post Thermal Dec'));
data = [line_props(idx).XData(:) line_props(idx).YData(:)]

data = 16001×2

12.3436 -0.1052 12.3439 -0.1051 12.3443 -0.1051 12.3447 -0.1051 12.3450 -0.1051 12.3454 -0.1051 12.3457 -0.1051 12.3461 -0.1051 12.3464 -0.1050 12.3468 -0.1050