what does the "-1" means in conditional statement?

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Imtiaz nabi
Imtiaz nabi on 25 Jan 2022
Edited: Stephen23 on 25 Jan 2022
Hi I am trying to understand a code which has some "if" statemets.
Now normally we pass true or false to the if else statement right? but in this case the state has a -1 what does this -1 means?
here is the line of code that I am trying to understand
for i=1:CT.MaxSatNum
clear tempsat;
if (SimGlobal.aSatData(i).sOrbitData.sEphData.PRN~=-1)

Accepted Answer

DGM on 25 Jan 2022
Entering the if structure isn't conditional on -1, it's conditional on whether SimGlobal.aSatData(i).sOrbitData.sEphData.PRN is not equal to -1. The output of that test is a logical value.
A = 2;
if (A ~= -1)
disp('tested true')
tested true
A ~= -1 % this returns a logical scalar
ans = logical
Stephen23 on 25 Jan 2022
"there are only two statements true or false 1 and 0 right?"
MATLAB's logical class only has two values: true and false:
They are respectively equivalent to and often displayed as 1 and 0.

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