Finding the first and last element of a matrix
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Dear all,
I have a problem and I hope somebody can help.
I want to find the value of min, max, start and end of different columns (rows 1:50) of my matrix in a loop.
the formula below gave me the min and max as I wanted:
f = 1:nfiles
output1 (:,f)= min (mydata (1:50 (:,f),f));
otput2 (:,f)= max (mydata (1:50 (:,f),f));
Now how can I find the first and last element? So in my case the 1 and 50?
I hope I am clear enough.
Thanks in advance,
Sobhan
Antworten (2)
Thomas
am 30 Mai 2012
Suppose you have a matrix of 5 columns by 50 rows
val=rand(50,5); % generate the data
min_val=min(val) % min value in each column
max_val=max(val) % max value in each column
first_ele=val(1,:) % first value
last_ele=val(50,:) %last value (50th)
edit
IF you donot know the position of last element use
last_ele=val(end,:) %last value
2 Kommentare
Nurye Hassen
am 23 Nov. 2017
The first element is obvious.i.e. A(1,1) gives you the first elemnt of A. But for the last one, When ever the loop changes you can ask the new number of the row and its respective value. Here is an example..Inside the loop write... For matrix A
rows=size(A,1); Value=A(rows,end);
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