Matlab variable rounding issue
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I have a variable (B_WD) that is a 295x4 double, which I am plotting using quiver. It is wind direction vectors ploted over time along a line.
quiver (B_WD(:,1),B_WD(:,2),B_WD(:,3),B_WD(:,4), 'k');
Varibles before code runs.......(4 lines)
738226.7222 0.0000 -0.3000 -0.8000
738226.7292 0.0000 0.2000 -0.5000
738226.7361 0.0000 0.3000 -0.5000
738226.7431 0.0000 0.3000 -1.1000
The first column is the position on x-axis (I am plotting the arrows along a line -hence the zeros in column 2).
When I run the code the first column switches to less precision, rounding to 2dp and some arrows plot from the same start point
Variable after code runs......see rounding
738226.7200 0.0000 -0.3000 -0.8000
738226.7300 0.0000 0.2000 -0.5000
738226.7400 0.0000 0.3000 -0.5000
738226.7400 0.0000 0.3000 -1.1000
I have been reading the help and have tried changing the format of the variable to 'long', I have replaced numbers and re-saved, nothing seems to stop this.
Advice greatly appreciated
3 Comments
Bruno Luong
on 21 Jul 2022
Edited: Bruno Luong
on 21 Jul 2022
"When I run the code the first column switches to less precision"
You should tel us what is the code. If you don't change/assign the variable it should remain identical.
Answers (1)
Chunru
on 21 Jul 2022
Edited: Chunru
on 21 Jul 2022
B_WD = [
738226.7222 0.0000 -0.3000 -0.8000
738226.7292 0.0000 0.2000 -0.5000
738226.7361 0.0000 0.3000 -0.5000
738226.7431 0.0000 0.3000 -1.1000 ];
quiver (B_WD(:,1),B_WD(:,2),B_WD(:,3),B_WD(:,4), 'k');
% The first column looks like datenum
datestr(B_WD(:, 1))
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