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".

Is there any solution for my case

Thanks

Answer 1

[BhaTTa]

Hey @Skydriver, I see that the else condition inside the for loop does not have any if condition, Please refer to the below corrected code:

LPi_all = [];

for i = 1:length(FS1)

depth_allD = [];

if FS1(i) <= 1

for j = 1:length(depth)

if depth(j) < 20

w = (10 - 0.5 * depth(j));

else % This handles the case where depth(j) >= 20

w = 0;

end

LPi = (1 - FS1(i)) * w * 3;

% Collect LPi value for each depth(j)

depth_allD = [depth_allD, LPi];

end

else % This handles the case where FS1(i) > 1

LPi = 0;

depth_allD = [depth_allD, LPi];

end

LPi_all = [LPi_all; depth_allD];

end

Hope it helps.

[Skydriver]

Thanks. I appreciate with your answer it helpfull to solve my problem

Answer 2

[Walter Roberson]

    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  

should probably be

    for j=1:length(depth)
        w = nan;
        if depth(j) < 20
            w=(10-0.5*depth(j));
        elseif depth(j) > 20
             w=0;
        end
        LPi= (1-FS1(i))*w*3;

Notice the initialization of w to nan in order to catch the case where depth(j) is exactly 20, which is a case that your code does not define.