Nothing
right <- function(angle, angle0){
if (angle<0){
angle=360-(-angle)
}
angle=(90-angle0)+angle
angle=(angle)%%360
if (angle >=0 & angle <=90){
angle=90-angle
}
if (angle >=90 & angle <=180){
angle=-(angle-90)
}
if (angle >=180 & angle <=270){
angle=180+90-(angle-180)
}
if (angle >=270 & angle <=360){
angle=90+90-(angle-270)
}
return(angle)
}
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