solve equation for variable and how to get output as number not as substituted form

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sita
sita on 27 Jan 2015
Commented: sita on 28 Jan 2015
Hi, I tried solving following code.solved for t and i want to substitutethat value back into equation. please help me
x1=rand(1); y1=rand(1); r = 10; v1= 2*rand(1); v2= 2*rand(1); sym t eq=(x1+t*v1)^2+(y1+t*v1)^2-r^2
solt=solve(eq,t); subsv=subs(eq,{t},{solt})
Thanks, Sita

Accepted Answer

A Jenkins
A Jenkins on 27 Jan 2015
x1=rand(1);
y1=rand(1);
r = 10;
v1= 2*rand(1);
v2= 2*rand(1);
syms t
eq=(x1+t*v1)^2+(y1+t*v1)^2-r^2;
solt=solve(eq,t);
subsv=subs(eq,{t},{solt});
>> help vpa
vpa Variable precision arithmetic.
R = vpa(S) numerically evaluates each element of the double matrix
S using variable precision floating point arithmetic with D decimal
digit accuracy, where D is the current setting of DIGITS
>> vpa(subsv)
ans =
0
0

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