Implementation if statement with two different conditions

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Skydriver 2018-2-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/383699-implementation-if-statement-with-two-different-conditions

I have a code using if and else with two different condition 1. if FS1 <= 1 else FS1>1 2. if depth < 20 else depth>20

This is detail of my code: LPi_all=[ ]; for i=1:length(FS1);

    depth_allD=[ ];
    if FS1 <= 1 
    for j=1:length(depth);
        if depth < 20        % F=1-Fs
            w=(10-0.5*depth(j))  
        else depth > 20
                w=0     
           LPi= (1-FS1(i))*w*3
        end  
    else FS1>1
            LPi= 0 
    end
end
 I have a wrong position in the placement the second else. 
Error: File: Input_RegLPI.m Line: 335 Column: 5
Illegal use of reserved keyword "else".