Why to use vpa instead of double in dealing with symbolic variables?

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Hello, I have a matrix in symbolic form and I want to convert it or display it as float. How to do this? Here is my simple code:
syms X Y
F=[(50*Y)/3 + 127/120, (50*X)/3 + 31/1000;54*Y - 319/600, 54*X + 917/1000];
double(F)
However matlab gives error for last line and I have to use vpa. I don't want to display F as having fractions, so I want to convert it to float. Anyone having any comments?

Accepted Answer

Sean de Wolski
Sean de Wolski on 29 Jan 2014
For display
vpa(F,5)
You can't convert it to double because X and Y are symbolic. To convert it to double, you would first have to use subs to substitute values for X and Y.

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