MATLAB: Extracting data from matrix row vector

data collection

I have a double Streams with some process I have got vector F which has a value Now I want to go back to the Streams and locate value matching value of F; get 100 columns forward and collect all the data between those two columns. I tried with ismember to locate the position of F in Streams but no success

 Data=Streams(J: (J-2544))%does not work

Best Answer

MATLAB by default increments using the colon ‘:’ operator. If you want it to decrement, you have to tell it specifically to use a negative step.

See if this does what you want:

Data=Streams(J : -1 : (J-2544));

Notice the ‘-1’ step.

Related Solutions

MATLAB: Closest value in an array, and how to correctly look it up afterwards

It is not entirely clear to me what you are trying to do. My best guess is that, for each element y(l) , you want to find the element in x that is closest to y(l). If so, the following should do the trick:

c = zeros(size(y));
index = zeros(size(y));
for l = 1:NN
    [c(l),index(l)] = min(abs(x(:)-y(l)));
end
search_x = x(index)

MATLAB: Can’t understand the warning

Indices must have positive integer values for obvious reasons. If any value of pos is not integer, this warning appears and you should fix this depending on your needs. Perhaps pos = round(pos) is a suitable solution, but floor or ceil are possible also.

Best Answer

Related Solutions

MATLAB: Closest value in an array, and how to correctly look it up afterwards

MATLAB: Can’t understand the warning

Related Question