Recent content by iasc

Hey, I have this code for lu decomposition but It doesn't quite work. If anyone could help me with the problem I'd be very appreciative. for(j=0; j<N; j++) for(i=j+1; i<N; i++) U[i][j]=0; for(j=0; j<N; j++) for(i=j+1; i<N; i++)...

The question is: Compute the determinant of the n × n matrix A for which aij = max(i, j). I can compute determinants but I don't really know what the last bit means. Any help appreciated.

I'm trying to write a piece of code for the rule 'i before e except after c'. Heres what I have so far. if(str[4]=='c') && if(str[5]=='ei') printf ("yes\n"); else printf("no\n"); I don't really want the answer but I just want to know if I'm going in the right direction.

Could anyone tell me how to use the cross product to prove the sine rule

That was very helpful. Thanks a million.

OK, I'm not really sure what the answer is. One of my matrices is 1 2 0 0 -3 11 0 0 1 0 -5 15 0 0 0 1 -1 5 Could you point me in the right direction please.

The question reads "Use the reduced row echelon forms that you computed to describe the solution set for each of two linear systems we consider". What I don't understand is what it means by The solution set for each of the two linear systems. Could someone clear this up for me. Any help...

Thanks for the help. I got 1 2 0 0 3 -11 0 0 1 0 5 -15 0 0 0 1 -1 5 I think this is right. I did it the other way round HallsofIvy.

Hey Zorba I'm from Ireland and had to hand up this question in class today. You doing maths in trinity? As for the the question I couldn't quite get it. Sorry.

What exactly is a reduced row echelon matrix. I had to convert this to one: 1 2 1 1 1 1 -3 -6 -2 0 -1 -3 2 4 2 1 3 -3 And got: 1 2 1 1 1 1 0 0 1 3 2 0 0 0 0 1 -1 5 Is this right and, if not, why? Thanks for the...

I was wondering if someone could help me this Navier-Stokes Equation. f[(δv/δt) + v.Dv] = -DP + Dt + f Could someone maybe explain the symbols and what it means. I'm not sure but I think Navier-Stokes equations describe fluid motion. (The P could be ρ. I'm not too sure) Thanks

Thank you for clearing that up. She said something about the same force used to keep a nucleus together is also present in a meson, or something like that. I didn't completely understand it

In my physics class my teacher said that a meson is made up of one quark and one anti-quark. But when, for example, an electron are that close to a positron pair annihilation occurs. Why does this not happen in a meson?

Its not that I think I'm too dumb, its just I've heard that you have to be very smart to do physics (its theoretical physics I was thinking of doing). Also I tend to struggle sometimes with some of the very hard questions

I am going to college next september and need to choose what I want to study. I am going between physics and engineering and I would choose physics except I don't know if i'll be smart enough for it and also I don't think there are many jobs in it. Any advice is greatly appreciated.