how to plot smooth line plot?

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Vishnu Dhakad
Vishnu Dhakad 2020-2-5
评论： Vishnu Dhakad 2020-2-7
I have data in x,y.
I have plotted x,y in log scale in both axises
but I did not getting smooth plot.
How to get it like excel plot.
please find the attached data and pics of the plot
Figure01 from MATLAB
Figure02 from Excel
I dont have signal processing tool.
  4 个评论
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Rik
Rik 2020-2-5
If you want a smooth line in the loglog domain, you should interpolate in that domain as well.
Vishnu Dhakad
Vishnu Dhakad 2020-2-5
thanks for your suggetion
how to do?

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回答（2 个）

Hiro Yoshino
Hiro Yoshino 2020-2-5
How about increasing the number of data by using interpolation?:
https://jp.mathworks.com/help/matlab/ref/interp1.html?s_tid=doc_ta
Rik
Rik 2020-2-5
The code below generates some example data and then interpolates the data in the loglog domain.
%generate some example data
X=exp(linspace(log(0.25),log(32),40));
Y1=randi([15 25],1,numel(X)).*exp(X./15);
xq = (0.25:0.001:32);
V = exp(interp1(log(X), log(Y1), log(xq), 'spline'));
figure(1),clf(1)
loglog(X,Y1,'.b')%plot orignal data
hold on
loglog(xq,V,'r')%add interpolation
hold off
  3 个评论
显示 1更早的评论
Rik
Rik 2020-2-6
I didn't use your data, but generated some random data. Did you try using your data and my code?
Vishnu Dhakad
Vishnu Dhakad 2020-2-7
Yes, I have used your code.

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