format of output in command window

I am getting output of simple math equations

 36.0801*1.1462-181.04*(-.13341-.05423*K))/36.0801 

(53973921897849552896*K)/198352447406604296875 + 720263206506893453689/396704894813208593750.

i am not getting the decimal form!

i need the answer in decimal form so as to perform more calculations

[Azzi Abdelmalek]

You are getting this result from what?

Answer 1

[Ahmed Rashid]

You can use

syms K
A = (36.0801*1.1462-181.04*(-.13341-.05423*K))/36.0801;
d = 5; % decimal accuracy;
vpa(A,d)

[Walter Roberson]

Correct.

However, the result is still going to be in terms of the symbolic variable K, and so is going to have to be a symbolic expression; it cannot be converted into double. There is no circumstance you are likely to run into under which a symbolic expression in floating point representation can be any more useful for further calculation than the same symbolic expression in rational form.

If the K was not there, then there might be reason to use double(A) instead of vpa(A), as there are cases where you need a double for calculation where a symbolic constant in rational form will not work. But this is not one of the cases, so the poster might as well leave the result unconverted until the poster has a numeric K value to substitute in.

[Ahmed Rashid]

If you want to evaluate the expression you can use

syms K
A = (36.0801*1.1462-181.04*(-.13341-.05423*K))/36.0801;
subs(A, K, 1) % K = 1;

[M Gokul]

thank you I found out that. Vpa has to be used wen using symbolic var thanks very much