how to get absolute value ?

Question

Aniket 2013-4-11

评论： James 2013-10-31

采纳的回答： Jan

I have some error data with time. and i want to get minimum absolute value from one time point till end time point.

for example

time 0 1 2 3 4 5 6

data 0.3 0.4 0.5 0.6 0.8 0.9 1.0

in the above example i want to get minimum absolute value from time = 3 to time = 6

so should i get this ?

right now i am doing like this

y = min(abs(e(3,end)))

e is variable where i am saving this time and data

Answer 1

Jan 2013-4-11

time = [0 1 2 3 4 5 6]:
data = [0.3 0.4 0.5 0.6 0.8 0.9 1.0];
ini = find(time == 3);
fin = find(time == 6);
result = min(abs(data(ini:fin)));

Aniket 2013-4-11

for my simulation i amgetting data like this

e{1,1} first coloumn time points and second coloumn data for how should i write abs command ?

y1 = min(abs(e{1,1}(18077:end)))

18077 is row number.

James 2013-10-31

Indexing a matrix is:
e(rows,columns)
so you want to use:
e(18077:end, 2)