Symplify symbolic expression instead of outputting very large denominator values

Hello,

In this code:

z = 1;
Q = z^2 -1.368*z + 0.368 + 0.368*k*z + 0.264*k

I get the answer as:

Q =
  (79*k)/125 - 1/9007199254740992

Is it possible to leave the final equation like this form:

Q = 0.632*k

Thanks.

Answer 1

[Star Strider]

Use the vpa function:

Q = vpa(Q,4)

Q =
0.632*k

[monkey_matlab]

not sure why but my answer comes out as

Q =

0.632*k - 1.11e-16
Is there some other setting that I have to activate within Matlab?

[Star Strider]

The imaginary part is essentially 0.

The only option that works is to use the children function:

syms k 
Q = (79*k)/125 - 1/9007199254740992;
Q = children(Q);
Q = vpa(Q(1),4)

Q =
0.632*k

[Walter Roberson]

That is not imaginary part, that is due to round-off and representation issues.

Take each of your numbers and wrap them with sym() with 'd' option. Like instead 0.368 code sym(0.368,'d')