MATLAB: Hi, how can I get the first row elapsed time as zero please, for eg, if I have a 42×6 date vector column, I get only 41 x 1 column of time differences.

elapse

My code : e = etime(t2, t1)

Best Answer

The etime function subtracts two date vectors, producing a single value (elapsed time in seconds). To get 0 as the first entry in the output, either duplicate the first entry in your date vector array, or simply concatenate a zero onto it:

e = [0; etime(t2, t1)]

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t = cumsum(etime);
v = cumtrapz(t, a);

MATLAB: Accessing var content in column, not location

Bad idea to name a variable 'all' as you will mask the ALL function!

A =[0   84.3000   90.0000   86.7000
      2.0000   86.4000   89.5000   87.6000
      4.0000   85.2000   88.6000   88.3000
      6.0000   87.1000   88.9000   85.3000
      8.0000   83.5000   88.9000   80.3000
     10.0000   84.8000   90.4000   82.4000
     12.0000   85.0000   89.3000   83.4000
     14.0000   85.3000   89.5000   85.4000
     16.0000   85.3000   88.9000   86.3000
     18.0000   85.2000   89.1000   85.3000
     20.0000   82.3000   89.5000   89.0000
     22.0000   84.7000   89.4000   87.3000
     24.0000   83.6000   89.8000   87.2000]
[Mx,Imx] = max(A(:,2:4));
[Mn,Imn] = min(A(:,2:4));
MXtime = A(Imx,1)  % This holds the times at the max.
MNtime = A(Imn,1)  % This holds the times at the min.

Best Answer

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