Error using streamline function in matlab

Hi

I am trying to plot the velocity vector and streamline from the data (file attached). The "quiver" function plots the velcoity vector but when I use "Streamline" function for the same data the figure shows no streamlines.

Attached Figure1 for velcoity vector, Figure2 for streamline plot

Code:

quiver(X,Z,U,W)

streamline(X,Z,U,W,startx,startz)

Answer 1

[Cris LaPierre]

Make sure your starting points are inside the vector field, and streamlines will plot.

load mukeshbisht_matlab.mat
quiver(X,Z,U,W)
startx = -2.9:.1:-1;
starty = 1:0.1:2.9;
hold on
plot(startx,starty,'rx')
hold off
axis equal

figure
streamline(X,Z,U,W,startx,starty)

Answer 2

[Star Strider]

The ‘startx’ vector is incorrect.

Try this —

LD = load('mukesh bisht matlab.mat');
U = LD.U;
W = LD.W;
X = LD.X;
Z = LD.Z;
% startx = LD.startx;                       % Incorrect Values
startz = LD.startz;

startx = X(1,:).';                          % Working Values

figure
quiver(X,Z,U,W)
hold on
streamline(X,Z,U,W,startx,startz)
hold off
axis('equal')

The plot is still not exactly what I would expect, however it is definitely closer to the desired result.

.