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.

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Walter Roberson
Walter Roberson il 21 Ott 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 Commenti
Kristin Aldridge
Kristin Aldridge il 21 Ott 2021
Thanks, I used lonWrapped=wrapTo360(lon) which I think is the same?
Walter Roberson
Walter Roberson il 22 Ott 2021
Modificato: Walter Roberson il 22 Ott 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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