Changing order of plot?

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Emil Doyle
Emil Doyle 2021-2-5
回答： David Coventry 2021-2-5
I'm trying to plot a set of data. This is my code:
clc
clear
close all
stat = importdata("static pressure.txt");
dir = importdata("direction.txt");
tot = importdata("total pressure.txt");
cp_cfd = (stat-tot)/(0.5*0.8*36.3^2);
plot(dir/0.1524,-cp_cfd,'r','.');
But, since direction.txt is not ordered for smallest to largest, the plot comes out like this (the plot function doesn't automatically order it):
I would like it to look like this (this is a scatter plot and I drew in a line in paint to show what I would like it to look like):
How would I do this?

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David Coventry
David Coventry 2021-2-5
You can likely sort the direction, and use the sorted index to reorder the y values.
See the documentation of sort for more information
https://www.mathworks.com/help/matlab/ref/sort.html
[x, I] = sort(dir/0.1524);
y = -cp_cfd(I);
plot(x,y,'r')

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