## 15 Reputation

6 years, 277 days

## matrix multiplication and iteration...

Maple

Hi

does anyone know how to make a programme to find values of B^j+1 and B^j+1 where:

matrix([[A^j+1],[B^j+1]]) = matrix([[C,D], [E,F]])*matrix([[A^j],[ B^j])

and with the initial condition that A^j =0, B^j=1. and then run to find say A^6 etc

thx

## plotting strange functions...

Maple

Hi

Does anyone know if it is possible to loglogplot a function like:

y=const, x=0..10^3

y=x^(-3/8), x=10^3..10^8

It would be really useful to plot.

## weird error that I don't understand...

Hi in trying to solve these coupled differential equations i get a weird error:

`> t := diff(X(x), x) = -(1-6*R(x)^(1/2))^(1/2)*x*X(x)/(X(x)*x+R(x))^(1/2), diff(R(x), x) = (1-6*R(x)^(1/2))^(1/2)*x^2*X(x)/(X(x)*x+R(x))^(1/2);                                        (1/2)                                /          (1/2)\                         d           \1 - 6 R(x)     /      x X(x)            --- X(x) = - -----------------------------, `

## solving linked differential eqautions...

I have a set of diffferential equations:

`> U := diff(X(x), x) = -10*(1-5*T(x)^2)^(1/2)*x*X(x)/(X(x)*x+R(x)), diff(R(x), x) = 10*(1-5*T(x)^2)^(1/2)*x^2*X(x)/(X(x)*x+R(x));                                       (1/2)                                   /          2\                         d           10 \1 - 5 T(x) /      x X(x)            --- X(x) = - ----------------------------,            dx                 X(x) x + R(x)          `

## Thx that has been helpful, would it be p...

Thx that has been helpful, would it be possible to sub these solutions F(t) into into another equation and then plot that as well?

The other equation is: n = 10*((1/100)*modulus(diff(F(t), t))^2+modulus(diff(F(t), t)))-1/2

but i don't know if it is possible to code for that, thanks guys when we learned maple it was a pathetic 2week course and i have been struggling.

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