How to use if statement to add if negative and minus if positive

Question

pkll201 2022-5-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/1730065-how-to-use-if-statement-to-add-if-negative-and-minus-if-positive

评论： Stephen23 2022-5-30

P5LANK Variable.mat

I am trying to write an if statement to add 180 if the value is negative, and minus 180 if the value is positive. I have tried the below script and it does not work! I do not know how to fix this, and was hoping someone might have an idea? get a bit stick on if statements so find it difficult to problem solve! I have also attached the bit of code beforehand for context

%% Zeros to NaN
P5LANK=PLANK;
P5LANK(P5LANK==0) = NaN;
%% Unwrap so doesn't jump at 180 degrees
P5LANK_unwrap=unwrap(P5LANK*pi/180)*180/pi;
[m,n] = size(P5LANK_unwrap);
%% Interpolate
[Ny,Nx] = size(P5LANK_unwrap);
Nz = sum(~isnan(P5LANK_unwrap));                          % Determine number of non-NaN
for k = 1:Nx
    P5LANK_interp(:,k) = interp1(1:Nz(k),P5LANK_unwrap(1:Nz(k),k),1:Ny,'linear','extrap');    
end
%% Minus 180
for k = 1:Nx
if 
    P5LANK_interp(:,k) > 0
    P5LANK_minus180 = P5LANK_interp(:,k) - 180;
else
    P5LANK_minus180 = P5LANK_interp(:,k) + 180;
end