Proper Labeling of X & Y values Contour Plot

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Alex Pettit 2022-5-25

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评论： Star Strider 2022-5-25

采纳的回答： Star Strider

Is there a way to use arrays for labeling the X&Y values of a Contour Plot ..

In this case, Y would be Frequency and X Time ( radio telescope data acq sequence )

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DGM 2022-5-25

How are you using contour? If you're calling contour() with three arguments, it should have ticks and tick labels on both axes already.

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Answer 1

Star Strider 2022-5-25

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在 MATLAB Online 中打开

Use the tick label properties to change the tick labels. Any new tick values have to be in the ranges of the current tick values, so changing them is not likely to produce the desired results.

[X,Y,Z] = peaks(50);

figure

[c,h] = contourf(X, Y, Z);

Ax = gca; % Axes Handle

xt = Ax.XTick % Tick Values

xt = 1×7

-3 -2 -1 0 1 2 3

Ax.YTickLabel = xt*pi; % New Tick Labels

yt = Ax.YTick % Tick Values

yt = 1×7

-3 -2 -1 0 1 2 3

Ax.XTickLabel = yt-min(yt); % New Tick Labels

xlabel('Time (units)')

ylabel('Frequency (units)')

.

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Alex Pettit 2022-5-25

GOT IT Nice : Thanks Everyone.

The data is in two column Freq / Ampl pairs from the SDR ( software defined radio ) at a data rate of

3000 FFT blocks per second. I am acquiring 5 minutes of data into one saved set .. consisting of 900,000 averages. Thankfully, I do not need to save the Time data !

FYI

Here is a surface plot of 100 data sets ( FFT 512 elements ) over ~ 8 hour period .

Freq range in the 1.42 GHz Hydrogen RF range .. Doppler shifted due th the relative motion of the Hydrogen clouds & Earth.

It represents a 10 degree wide, 8 hour long slice through the Milky Way and surrounding area

( A new hobby )