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

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Imtiaz nabi 2022-1-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635685-what-does-the-1-means-in-conditional-statement

编辑： Stephen23 2022-1-25

采纳的回答： DGM

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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)

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采纳的回答

DGM 2022-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/1635685-what-does-the-1-means-in-conditional-statement#answer_881300

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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
tested true
A ~= -1 % this returns a logical scalar
ans = logical
   1

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Imtiaz nabi 2022-1-25

So I shouldn't worry about any rocket science here... there are only two statements true or false 1 and 0 right?

Stephen23 2022-1-25

编辑：Stephen23 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:

https://www.mathworks.com/help/matlab/matlab_prog/fundamental-matlab-classes.html

They are respectively equivalent to and often displayed as 1 and 0.

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