Is there any way to increase the density of curve samples?

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Abdulaziz Abutunis 2017-6-3

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评论： Vandana Rajan 2017-6-15

Dear fellows,

I have a plot of multiple curves and I want, if possible, to increase the density of these curves (increase the data). It looks like be some thing that uses fitting tool or interpolation tool but I was not able to find any. I appreciate your help.

Thanks in advance Aziz

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Answer 1

Vandana Rajan 2017-6-13

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Hi,

Why don't you use the 'interp' function to interpolate the data and then plot it? Below is an example code snippet from the documentation.

t = 0:0.001:.029;                       % Time vector
x = sin(2*pi*30*t) + sin(2*pi*60*t);    % Original Signal
y = interp(x,4);                        % Interpolated Signal
subplot(211);
stem(x);
title('Original Signal');
subplot(212);
stem(y); 
title('Interpolated Signal');

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Abdulaziz Abutunis 2017-6-13

Thank you Vandana, Actually I tried this method but the thing I wanted was to have a regular "plot" because I had many curves on the plot.

Thanks Aziz

Vandana Rajan 2017-6-15

Hi,

In the same code snippet, if you change 'stem' to 'plot', you can see the effect of interpolation. The sharp edges on the curve (due to lack of data in between 2 points) becomes smooth as interpolation increases data samples in between them.

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