how to use spline for a fig. file?

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Sajid Sarwar
Sajid Sarwar 2019-7-3
评论： Sajid Sarwar 2019-7-3
Can I use spline to smooth the plot in attached file?

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Star Strider
Star Strider 2019-7-3
编辑：Star Strider 2019-7-3
Try this:
I = openfig('fft scma 25.fig');
Ax = gca;
lgnd = Ax.Legend;
Lines = findobj(Ax,'Type','line');
N = 5; % Interpolation Points Length Multiplication
for k = 1:numel(Lines)
X(k,:) = Lines(k).XData;
Y(k,:) = Lines(k).YData;
xq(k,:) = linspace(min(X(k,:)),max(X(k,:)), numel(X(k,:))*N); % Interpolation Points Vector
ys(k,:) = spline(X(k,:),Y(k,:),xq(k,:)); % Spline Fit To Data
end
figure
semilogy(xq', ys')
grid
legend(Ax.Legend.String)
xlabel(Ax.XLabel.String)
ylabel(Ax.YLabel.String)
Change ‘N’ to get the result you want.
This is essentially the same as my previous code, this time doing a spline interpolation.
EDIT —
Corrected typographical error. Code unchanged.

更多回答（1 个）

Walter Roberson
Walter Roberson 2019-7-3
Ninterp = 10;
Nplot = 100;
fig = openfig('fft scma 25.fig');
Lines6to1 = findobj(fig, 'type', 'line');
for idx = 1 : length(Lines6to1)
h = Lines6to1(idx);
xd = get(h, 'XData');
yd = get(h, 'YData');
x = linspace(min(xd), max(xd), Ninterp);
y = interp1(xd, yd, x, 'spline');
xx = linspace(min(xd), max(xd), Nplot);
yy = spline(x, y, xx);
set(h, 'XData', xx, 'YData', yy);
end

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