How to plot matlab stream plot?
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Rubel Ahmed
on 12 Jul 2021
Commented: Rubel Ahmed
on 6 Aug 2021
I have a 2D domain which has diffrent width(X) and length(Y) as attached photo. Say the height Y=0.05 and width X=0.02;
I have each particle position array in X,Y and I know the corresponding velocity of the particle in U and V.
If I create meashgrid say
[X1,Y1] = meshgrid(0:0.005:0.02,0:0.005:0.05);
Then how I create the dimension of U and V equal to the dimension of X1 and Y1? So that I can plot
streamline(X1,Y1,U,V)
Please help,Thanks.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/681668/image.png)
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Accepted Answer
Walter Roberson
on 12 Jul 2021
U1 = interp2(X, Y, U, X1, Y1);
V1 = interp2(X, Y, V, X1, Y1);
streamline(X1, Y1, U1, V1);
13 Comments
Walter Roberson
on 5 Aug 2021
Edited: Walter Roberson
on 5 Aug 2021
You can do a bit better by calling stream2() yourself, see the first example at
The idea is that you would filter down your coordinates. For example break up into two blocks, one the left area and the other the bottom area, so that you avoid doing all that interpolation for the large part of your plot that is empty.
It might take a bit of work to figure out where the useful boundaries are given only the scattered data. One approach would be a crude 2d histogram to find out which parts are occupied.
By the way, I just opened a case recommending specific performance improvements to streamline(). I doubt we will see them before 2022 however.
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