What this means sum( time(i,1:i-1) ) ?

time is a 5X5 matrix I want to know what means time(i,1:i-1) , I'm new at matlab

But I mean what does i,1:1-1 do whit the matrix, I know the results that this send, but I want to know like, It means that is taking the data from the matrix at.... something like that, thanks...

Answer 1

[Fangjun Jiang]

See it yourself: type the following lines one at time at the Matlab command window

time=magic(5)
i=4
time(i,1:i-1)
sum(time(i,1:i-1))

[Matt Fig]

Or, perhaps:

time = magic(5)

for ii = 1:5

T = time(ii,1:ii-1)

sum(T)

end

Run this and look at the output...

[Fangjun Jiang]

Good catch, Matt! I changed the value of i from 1 to 4 to avoid confusion.