Help with Smooth graph interpolation

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Eric Yoshida 2020-4-15

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评论： Star Strider 2020-4-16

I have two columns of data imported from excel in workspace labelled as "Sample 1". How can I take those columns and make a smooth graph? They are both 88 rows long with column 1 being my X values and column 2 being my Y values. Thank you!

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Star Strider 2020-4-16

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I have no idea what your data are, and I am not certain what defines ‘smooth’.

With that proviso, try this:

xq = linspace(min(Sample_1(:,1)), max(Sample_1(:,1)), numel(Sample_1(:,1))*10);
yq = interp1(Sample_1(:,1), Sample_1(:,2), xq', 'pchip');
figure
plot(Sample_1(:,1), Sample_1(:,2), 'xb')
hold on
plot(xq, yq, '-r')
hold off
grid

Experiment with the interp1 function 'method' arguments to get different results.

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Eric Yoshida 2020-4-16

Graph data.mat

Hopefully this helps. Sorry for the confusion!

Star Strider 2020-4-16

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No worries!

The ‘y’ field (the one that matches your description) is a table. It requires a bit of code to get its data.

Experiment with this:

D = load('Graph data.mat');
y = D.y;
vx = y.Column1;
vy = y.strain;
mult = 0.25;
xq = linspace(min(vx), max(vx), numel(vx)*mult);
yq = interp1(vx, vy, xq', 'pchip');
figure
plot(vx, vy, 'xb')
hold on
plot(xq, yq, '-r')
hold off
grid