MATLAB Answers

Info

This question is closed. Reopen it to edit or answer.

How can we precise the substituted values (to 04 numbers )after differentiation?

1 view (last 30 days)
Naga Ranjith Kumar Addagalla
Closed: MATLAB Answer Bot on 20 Aug 2021
I have differentiated the polynomial equation and have substituted the values to the variables. But I need to precise the values. Can any one please provide with answer?
  1 Comment
Naga Ranjith Kumar Addagalla
I am thankful for your answer. As I have solved by myself, I haven't seen the reply earlier. Please apologize.

Answers (1)

Maitreyee Mordekar
Maitreyee Mordekar on 8 Aug 2016
I assume that you are using MATLAB 2016a version. I have a small code snippet that I think is your concern.
syms x;
y=x.^3;
z=diff(y,1);
x1=3.0912345678;
z1=subs(z,x1);
This would display the z1 as a fraction. Just convert the z1 variable to a floating number precision. You may use single or double point precision.
z2=single(z1); %Single precision
z3=double(z1); %Double precision
This should return the result in a numeric format with the precision according to the double or single data type.
In case you can afford to stay in the symbolic domain, you may use the variable-precision arithmetic. The result will be a symbolic data and not a numeric one.
z4 = vpa(z1,10);
You may refer to variable precision arithmetic for the documentation.
Hope it helps.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!