How to make negative degree numbers positive while maintaining degree.

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I'm trying to use
if avg_deg < 0, avg_deg = avg_deg+360; end
but it isn't working. I don't want to use abs because I want to rotate these negative degrees to their positive counterpart, but the line of code isn't doing anything at all.

Accepted Answer

Walter Roberson
Walter Roberson on 21 Oct 2021
You can use logical indexing....
avg_deg = randi([-719 719], 1, 10)
avg_deg = 1×10
149 -15 -420 453 593 -132 594 712 344 423
mask = avg_deg < 0;
new_deg_version_1 = avg_deg;
new_deg_version_1(mask) = new_deg_version_1(mask) + 360
new_deg_version_1 = 1×10
149 345 -60 453 593 228 594 712 344 423
But I would suggest that mod() is more reliable, since it can handle angles < -360 and angles >= 360
new_deg_version_2 = mod(avg_deg, 360)
new_deg_version_2 = 1×10
149 345 300 93 233 228 234 352 344 63
  2 Comments
Walter Roberson
Walter Roberson on 22 Oct 2021
avg_deg = [randi([-719 719], 1, 5), -720, -360, 0, 360, 720]
avg_deg = 1×10
-617 -202 -77 -35 -677 -720 -360 0 360 720
new_deg_version_2 = mod(avg_deg, 360)
new_deg_version_2 = 1×10
103 158 283 325 43 0 0 0 0 0
new_deg_version_3 = wrapTo360(avg_deg)
new_deg_version_3 = 1×10
103 158 283 325 43 0 0 0 360 360
They differ on the treatment of positive multiples of 360.

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