Re: solving n unknowns n equations

In article <ca3a1623-2a7d-416f-89ee-93919fac0040@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<talhaaydin@xxxxxxxxxxx> wrote:
Hi, As you might guess I am beginner on matlab. please help me to
solve a part of my project. I have 5 eqns 5 unknowns. How can I solve
that?

There is no general method of solving that.

There -are- ways of solving systems of N equations in N unknowns
when the equations are in certain restricted domains, such as
being linear systems.


Besides can I convert a number say x=100/20 to x=5

That always happens and you cannot avoid having it happen
(except by using some fairly convoluted formulations with the symbolic
toolbox.)

I am going to make a wild speculation and guess that you might
perhaps have "format fraction" in effect. Try giving the command
format g

and lastly
how can I fix the digit number after decimal point for example to 3 or
4.

You cannot except for a relatively small number of cases. For example,
87 + 1/8 can be exactly represented in 3 decimal places, but
87.126 (that is, 87 + 1/8 + 1/1000) cannot be exactly represented
(except in the symbolic toolbox, using variable precision arithmetic.)

You -can- convert floating point numbers into character strings
that have any specific number of decimal places in the textual
representation. For example,

numberastext = num2str(87.126,'%0.3f')
--
"The study of error is not only in the highest degree
prophylatic, but it serves as a stimulating introduction to the
study of truth." -- Walter Lipmann
.

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