Recent content by hexa

Hello, thanks a lot, that's something already. I'm just not quiet sure what to do with this. lets assume I have par1-par2-par3 = 80 par2-par3-par4 = 95 Please can you give me a few more hints? I understand just as much that I have to solve this in a matrix somehow, but what to solve...

Nothing. I don't know what you're talking about. If I knew how to formulate my question clearly then I think I would already be a step closer to solving my problem simply as I would have at elast some basic knowledge on statistics. hexa

Because I'm still trying to find out which combination works best, and if there's a minimum number of input parameters for a good result, and if that number is depended on the types of input parameters. I just don't know how to compare the results correctly now :(

Hello, I've been running a model with different combinations of imput parameters. Let's just assume they look like this: 1,2 1,3 1,4 3,4 1,2,3 2,3,4 1,2,3,4 As a result I receive a certain numerical value. Jus by looking at that value I can see if the result is good or not. But...

Hello, I tried to find a fitting forum but did not quiet succeed. The following diagram is an example of something I've been given at work. I try to understand it but fail with that. http://img98.imageshack.us/img98/4770/testwk3.png So how do I understand such diagram? The upper black...

Thanks a lot, the link seems to be what I was looking for. So let's see if we can work out how large the field of view is :D Hexa

Hello, I thought I help my nice with her microscope. We want to know how large some plant cells are that we're looking at. Hoe do we do that? There is no scale inside the microscope so I wonder if it possible to work out how large the field of view is with a certain lense. What do we have...

Hi David, that was also my intuition. I got confused by an old exam question about visualising such heightfield as vectorfield:confused: and could not find a direction. Thanks a lot Hexa

Hello, I've been wondering if a heightfield is a scalar or a vector, and how many dimensions in space it has. Sure, if it's a scalar it only has a magnitude, and as a vector magnitude and direction but I cannot see either, or keep them apart in this case. Density or gravityacceleration are...

Thanks a lot for your help. I'll work on with this. Calculus: not a term used in this country, so I'm not quiet sure where the border is between precalculus and calculus.

I'll be greatful for any hint. Imagine you walk over the contourlines of the map of a mountain (really! that's the question) with a gradient of h(x,y)=2xy, x^2). You are at point (1,3) and you want to walk downslope at an angle of 45 degrees. calculate the unit vector in order to find out in...

Hi, I'm trying to calculate a 2d integration with the result being an average. Let the sum be x^2 + y^2 and the domain [-1 x 1; -3 y 3] (The actual sum is more complicated but that's too difficult to write here) so I thought: 1/(3+3) integrate 1/(1+1) integrate x^2 + y^2 dxdy but...

Please could someone explain to me how to visualise a vector field? Let's say it's v(x, y) = (2.5, -x) on whatever domain. I tried it the same way as I would visualize a scalar field but the results did not correspondent at all with the results I'd expect. The same for drawing the field along...

Does someone want to think along with me? field h(x,y) = x^2 y calculate gradient for this field and draw it for point (1,3): calculate this point: nabla h = (2xy, x^2) = (2*1*3, 1) = (6, 1) But how do I draw this into the field of x^2y? I know I have to draw a vector. Would this...

you're right, daveb, didn't think of the domain. But still that's more or less what I thought. Thanks a lot for confirming.