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#1 2014-10-01 01:13:20

mrpace
Member
Registered: 2012-08-16
Posts: 88

Differential equations problem

write the system

x'(t) = -3x(t) +y(t) +e^t + 1
y'(t)= 2x(t) - cost

In the matrix form x' = Ax + f

could this really be so simple as x' = {-3, 2}x +f ??
or is there more to it?

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#2 2014-10-01 20:53:21

Olinguito
Member
Registered: 2014-08-12
Posts: 649

Re: Differential equations problem

[list=*]
[*]DifferentialEquationMatrix.gif[/*]
[/list]

Off-topic: Why isn’t LaTeX working? hmm


Bassaricyon neblina

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#3 2014-10-01 21:10:44

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Differential equations problem

The apostrophe for the derivative has not worked since before the upgrade and if I remember JFF was one of the people along with phrontister(?) that discovered a fix for that problem.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#4 2014-10-01 21:25:31

Olinguito
Member
Registered: 2014-08-12
Posts: 649

Re: Differential equations problem

So instead of x' you have to type x^{\prime}?

[list=*]
[*]

[/*]
[/list]


Bassaricyon neblina

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#5 2014-10-01 21:27:15

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Differential equations problem

Amazing that you rediscovered her solution so quickly, I had been unable to find it...


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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