what does the "-1" means in conditional statement?
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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)
采纳的回答
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')
end
A ~= -1 % this returns a logical scalar
4 个评论
Imtiaz nabi
2022-1-25
"ok but why is -1 used here? can we use 0 or something else?"
That depends entirely on what the values of SimGlobal.aSatData(i).sOrbitData.sEphData.PRN can be, and what those values mean. The documentation of the code you are looking at should tell you that.
Imtiaz nabi
2022-1-25
"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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