Date: Jan 28, 2013 11:04 AM
Author: Steven Lord
Subject: Re: There are a way of instruct the matlab to use sin(pi) = 0 in the symbolic computations?

"Fernando " <fernandovm@gmail.com> wrote in message

news:ke63gc$c5r$1@newscl01ah.mathworks.com...

> Hi,

>

> I have the equations system eqs = [(sin(2*q1)*i)/2; -(sin(2*q1)*i)/2]

> and when I do solve(eqs == 0) I get zero as unique solution, I know that,

> due to limited precision, is correct the matlab does not to make sin(pi) =

> 0. But, would be very usefull to me if I could make some symbolic

> computations using sin(pi) = 0, and equally cos(pi/2) = 0. There are a way

> of instruct the matlab to use both sin(pi) and cos(pi/2) equal to zero in

> the symbolic computations?

Make it symbolic.

spi = sym(pi);

sin(spi)

cos(spi/2)

--

Steve Lord

slord@mathworks.com

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