## how to construct if for vectors with positive and negative?

on 23 Oct 2018

on 24 Oct 2018

### Dennis (view profile)

Kraft=500:1000:1510;
Geschwindigkeit=10:50:160;
DrehzahlICE=1484
DrehmomentICE=50
DrehmomentAchsesoll= Kraft*0.324;
DrehmomentAchseist=DrehmomentICE*1.54*2.64;
Drehmomentbrauch=DrehmomentAchsesoll-DrehmomentAchseist;
idx2 =Drehmomentbrauch<0;
idx3 =Drehmomentbrauch>=0;
Drehmomentbrauch1=Drehmomentbrauch.*idx2;
Drehmomentbrauch2=Drehmomentbrauch.*idx3;
while Drehmomentbrauch1< -1 | Drehmomentbrauch2 > 1
if Drehmomentbrauch1 < -1
DrehmomentICE = DrehmomentICE -0.4;
DrehmomentAchseist=DrehmomentICE*1.54*2.64;
Drehmomentbrauch=DrehmomentAchsesoll-DrehmomentAchseist;
elseif Drehmomentbrauch2 > 1
DrehmomentICE = DrehmomentICE + 0.4;
DrehmomentAchseist=DrehmomentICE*1.54*2.64;
Drehmomentbrauch=DrehmomentAchsesoll-DrehmomentAchseist;
end
this code works perfectly for only negative or only positive values but if the vector contains both then it skips the loop
the problem can be seen in the current example
basically i want to calculate it to get a vector of DrehmomentICE at end

### Dennis (view profile)

on 24 Oct 2018

Small example to understand what is happening:
Lets take a vector and check if all values are >0.
test=1:5>0
In this case test is a logical array containing only ones. A while loop will only work as long ALL conditions in your vector are true. This loop will execute only once:
while test
disp(test)
test(1)=0;
end
Therefor in your code your loop will only work with all values <-1 or all values >1. An easy fix would be to use any.
while any(test)
disp(test)
test(randi(5))=0;
end