Hi,

I need to solve the following system of equations:

eq1 := (vi-vg)/Z0 - (vg-vs)/Z1-(vg-vd)/Z2;

eq2 := vs - [(vg-vs)/Z1 + gm*(vg-vs) + (vd-vs)/r0]*Z3;

eq3 := (vg-vd)/Z2 - gm*(vg-vs) - (vd-vs)/r0 -vd/Z4;

I am expecting the solutions for vg, vs, vd, so the following command was used:

solve({eq1,eq2,eq3},{vg,vs,vd});

but it kept giving me the warning message of: 

so...here it is that equation:

du/dt   = d²u/dr² +  du/r*dr  +  u  +  f(r,t);     r=(0,...,2]; t(0,...,1]

also we have conditions:

u(r,0)=0;

u(0,t)=t^2;

u(2,t)=0

I need to find u(r,t) and to graph it

r and t are cylindric coordinates.

f(r,t) is some definite function.

Hey all,

My question is better explained with an example

the algorithm I have here creates a matrix M[j] for each run of j.

I want to be able to export each of these matrices to a different spreadsheet and if possible, set up a naming critiria for each spreadsheet(so that I dont have to enter a name in the dialog box after each run)

Any suggestion will be really appreciated. Thanks

Lovinash

here's the example:

How can I create a vector using a step index, for example, using the function output f:=1/i+1 and alternate it with a zero

 that produces a vector such as,  0,1/2,0,1/3,0,1/4,0,1/5.....?

Every attempt I tried failed.

How can I manipulate the scale of dominion?

As you can observe with the graphic can not be examined.

Gracias

Hi everyone,

I have a 2nd order system which I want to solve. But the solver outputs no results after evaluation, just returns to the prompt. Do you know what I am doing wrong?

deq1:=diff(x[1](t),t$2)=k[1]/abs(x[2](t)-x[1](t))^2;
deq2:=diff(x[2](t),t$2)=k[2]/abs(x[2](t)-x[1](t))^2;
sys_ode:=deq1,deq2;
ICS:=x[1](0)=5, x[2](0)=10, D(x[1])(0)=0.1,D(x[2])(0)=0.2;
dsolve({sys_ode, ICS});

thanks.

Good morning.

I have a problem.

My Foco1 function is slower than Foco and how can i do it faster?, because that takes a long time.

26-05-2011-robot-man.mw

thank your for your answer

I want to search maple files for specific texts within the file.  What software will do this?

I recall some mention before about searching for specific texts in maple documents but I cannot find it. 

Hi there,

I got an output

and would like to bring it in the form

.

How do I do that? :)

In fact I don't even manage to collect the factor of 3*beta^2 as follows

I copied a column of figures from Excel and pasted them into an Maple worksheet.  Maple displayed a column vector with the appropriate values.  I set the variable y equal to this vector and was able to verify that, for example, y[3] had the correct value.  However, when I tried to use y[i] after a summation symbol which used i as the index I got the error message "Error, bad index into vector".  The summation expression worked fine when I redefined y by the following:

The original question I posed was whether I could control the output format of a complex array in MathML. I will pose the more general question, how could I customize the MathML output (much like LaTeX output can be customized)?

Regards.

I'm putting together what will eventually be a rather large simulation system that I want to be able to maintain across a reasonably large organization. Do you have any recommendations for Source Code Control/Versioning systems that work with your .msim file format or should I resign our team to exporting/importing code back and forth into Modelica for source control?

Thanks.

so i have a 2D curve f(x), i need to calculate end coordinates of both normal vectors, that are perpendicular to this curve at point x=a, with vector length=l.

simplest way to make it happen anyone?

thanks

When I try to solve a DAE system I got this error:

               Error, (in dsolve/numeric/DAE/applysub) numeric exception: division by zero

Any ideas?
Thanks everybody for help!