does 'VPA' changes the type of a data variable ?
2 views (last 30 days)
Show older comments
Hi everyone
I have a question about the data type.
I know that all data are double floating-point in Matlab by default.
I've written this code and when I use 'whos function' for 'z', Matlab says that z is 'double' which is what I expect.
s=500;
t=[12 25 36 12 1 8 9 20 9 7 5 2 74];
z=0;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for i=1:10
z=z+t(i);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
z=s-z;
whos function:
whos z
Name Size Bytes Class Attributes
z 1x1 8 double
I've added one line (line 8) and used VPA, when I repeat what I've said above, Matlab says that z is 'syms'.
s=500;
t=[12 25 36 12 1 8 9 20 9 7 5 2 74];
z=0;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for i=1:10
z=z+t(i);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
z=vpa(z,10);
z=s-z;
whos function:
whos z
Name Size Bytes Class Attributes
z 1x1 112 sym
does VPA change the data type?
I really appreciate any explanation for this change and totally about syms.
0 Comments
Answers (1)
Chunru
on 27 Aug 2022
vpa(x) uses variable-precision floating-point arithmetic (VPA) to evaluate each element of the symbolic input x.
The input to x is supposed to be symbolic.
syms x
p = sym(pi);
piVpa = vpa(p)
class(p) % The type is sym
a = sym(1/3);
f = a*sin(2*p*x);
fVpa = vpa(f)
0 Comments
See Also
Categories
Find more on Numbers and Precision in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!