MATLAB: Where are the data

datafigureMATLAB

I plot a figure by using a function from a package.

Now I'd like to know the x and y values once I plot the curve.

Where are they stored

Best Answer

Try this:

F = openfig('untitled.fig');
ax = gca;
lines = findobj(ax, 'Type','Line');
for k = 1:numel(lines)
    x{k,:} = lines(k).XData;
    y{k,:} = lines(k).YData;
end

The x- and y-data for each line are in their appropriate cell arrays.

Related Solutions

MATLAB: How to make a plot smooth

It depends on what you intend by ’smooth’.

Try this:

I = openfig('scma25.fig');
Ax = gca;
Lines = findobj(Ax,'Type','line');
for k = 1:numel(Lines)
    X(k,:) = Lines(k).XData;
    Y(k,:) = Lines(k).YData;
    pv(:,k) = polyfit(X(k,:), Y(k,:), 3);
    yf(k,:) = polyval(pv(:,k),X(k,:));
end
figure
semilogy(X', yf')
grid
legend(Ax.Legend.String)
xlabel(Ax.XLabel.String)
ylabel(Ax.YLabel.String)

It uses polyfit and polyval to fit your data, then plots the fitted data in a new figure. It also re-uses your axis labels and legend strings.

MATLAB: Set the Ticks only on the X and Y axis

Set the axis box to 'off'.

Example —

x = 0:20;
y = sin(x*pi/9);
figure(1)
plot(x, y);
grid
ha = gca;
ha.Box = 'off';

See if that does what you want to do.

See the documentation for Axes Properties (link) for details.

Best Answer

Related Solutions

MATLAB: How to make a plot smooth

MATLAB: Set the Ticks only on the X and Y axis

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