How to make negative degree numbers positive while maintaining degree.

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.

Answer 1

[Walter Roberson]

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

[Kristin Aldridge]

Thanks, I used lonWrapped=wrapTo360(lon) which I think is the same?

[Walter Roberson]

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.