MATLAB: How to flip an axis on a plot without affecting the plot

axis

I am trying to rotate the y axis of this plot such that the origin is at the upper left coner of the plot. How would I do so?

This is the code I have to set up my plot.

% Plot averaged vector field
figure(3)
quiver(x(acceptIdx)/48.11,(y(acceptIdx)/48.11),u_avg(acceptIdx),v_avg(acceptIdx),4)
axis([0 42 0 42])
yticks([0 5 10 15 20 25 30 35 40])
set(gca,'XAxisLocation','top','YAxisLocation','left');
xlabel('z (mm)')
ylabel('x (mm)')
title('Dimensional velocity field')

I'd like the y axis to look identical to the x axis.

Thanks.

Best Answer

Try:

axis(gca,'ij')

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MATLAB: How do you shift the data such that the centerline of the jet is at 0

The goal isn't quite clear to me. If you'd just like to scale the quiver plots so that the longest axis fits within -1 to 1, follow this demo.

This first part creates a demo set of inputs that you presumably already have.

% Create quiver plot inputs
[x,y] = meshgrid(0:0.2:2,0:0.2:3);
u = cos(x).*y;
v = sin(x).*y;
% Plot the original data. X values span
% from 0 to 2, y values span from 0 to 3.
clf()
subplot(2,1,1)
quiver(x,y,u,v)
axis equal

This part is what would be applied to your data.

% Determine the range of your data
xRange = range(x(:));
yRange = range(y(:));
scale = max(xRange, yRange);
% Scale data so it's longest axis is within [-1,1]
xS = (x - min(x(:)))/scale*2 - xRange/scale;  
yS = (y - min(y(:)))/scale*2 - yRange/scale;
% plot the scaled quiver values
subplot(2,1,2)
quiver(xS,yS,u,v)
axis equal

Or are you trying to find the center point between the two focii?

MATLAB: Remove unwanted vectors from a vector plot

To eliminate any quiver arrow that start below a given threshold along the y-axis,

% 1) Choose a threshold
yThreshold = 100; %accept all vectors that start at or above y = yThreshold; 
% 2) identify all quiver arrows that meet the criteria 
acceptIdx = data.y >= yThreshold; 
% 3) plot the quiver arrows, but only the ones accepted
figure()
quiver(x(acceptIdx), y(acceptIdx), U(acceptIdx), V(acceptIdx), 5)
% add reference line at threshold if you'd like
yline(yThreshold);

Alternatively, you can identify the yThreshold as some distance from the smallest y-value. In this example below, the yThreshold is set to the minimum y-value plus 0.1% of the range of y-data.

yThreshold = min(data.y) + range(data.y)*.001

Best Answer

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MATLAB: How do you shift the data such that the centerline of the jet is at 0

MATLAB: Remove unwanted vectors from a vector plot

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