how to use spline for a fig. file?

Question

Sajid Sarwar 2019-7-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470144-how-to-use-spline-for-a-fig-file

评论： Sajid Sarwar 2019-7-3

采纳的回答： Star Strider

fft scma 25.fig

Can I use spline to smooth the plot in attached file?

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Answer 1

Star Strider 2019-7-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470144-how-to-use-spline-for-a-fig-file#answer_381855

编辑：Star Strider 2019-7-3

在 MATLAB Online 中打开

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.

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Answer 2

Walter Roberson 2019-7-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470144-how-to-use-spline-for-a-fig-file#answer_381858

在 MATLAB Online 中打开

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