Last week I asked about manipulating a Matrix into the form:
pts := [[x1,y1],[x2,y2]...[xn,yn]]
I was directed to use the zip function, which after some trial and error I have "successfully" done. The problem I am having (I think) is that I am using Maple9. Using the zip function as in the example:
I need to solve the heat diffusion equation in a system with two enclosed walls. The first wall (made of a material called fr4) goes from x=0 o x=d1, and the second wall (made of copper, that is cu)from x=d1 to x=d2.
u(x,t) is my unknown (change of temperature with time and space) for the first wall, and v(x,t) the unknown for the second wall.
So the system of PDEs to solve is:
>PDE:=[ diff(u(x,t),t) = afr4*diff(diff(u(x,t),t) ,
I have a function in 2 variables - lets make it easy, the function is:
f(beta,c_0) = beta-6*beta*c_0+3*beta*c_0^2
I want to know in which regions this function has positive values and where it is negative. Tried it with the command contourplot, but this is not telling me anything :(.
Hope somebody can help
is there any way to solve a system like (d denotes the derivates):
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