How apply more than one "if" to determine different changes in one "matrix"

Hi guys!

I want apply some conditions to determine my "data", starting from a "base" file. I tried this:

for i=1:length(base)
  if isfinite(base(i))<=24.2;
     data(i)=1.5393*base(i)-13.2;
     if isfinite(base(i))>=24.8;
        data(i,4)=1.3775*base(i)-9.93;
        if isfinite(base(i))>24.2 & isfinite(base(i))<24.8;
           data(i,4)=1.1147*homei(i,4)-3.184;
        end
     end   
  end
end

But only the first condition was resolved and i don't know what to do to resolve the others two.

Thank you already,

                 Gustavo

Answer 1

[dpb]

for i=1:length(base)
  if isfinite(base(i))<=24.2;
    data(i)=1.5393*base(i)-13.2; 
      if isfinite(base(i))>=24.8;
        data(i,4)=1.3775*base(i)-9.93;
        if isfinite(base(i))>24.2 & isfinite(base(i))<24.8;
          data(i,4)=1.1147*homei(i,4)-3.184;

Since isfinite is a logical, it's output is either 0 or 1 so only the first case would ever be true regardless of the value of base. Eliminate it entirely, then use Matlab vectorized logical addressing to modify the areas of interest.

data=base;                           % create the second array
ix1=base<=24.2);                     % logic vector for condition 1
data(ix1)=1.5393*base(ix1)-13.2;     % set data for those
ix2=base>=24.8;                      % and condition 2
data(ix2)=1.3775*base(ix2)-9.93;
ix=~(ix1 | ix2);                     % the inbetweens are those not >= or <=
data(ix)=1.1147*base(ix)-3.184;

Answer 2

[Azzi Abdelmalek]

for i=1:length(base)
   p=base(i)
   q=isfinite(p)
   if q<=24.2;
      data(i)=1.5393*p-13.2;
   elseif q>=24.8;
      data(i,4)=1.3775*p-9.93;
   elseif q>24.2 & q<24.8;
      data(i,4)=1.1147*homei(i,4)-3.184;
   end
end