Info

此问题已关闭。 请重新打开它进行编辑或回答。

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

1 次查看（过去 30 天）
Naga Ranjith Kumar Addagalla
关闭： MATLAB Answer Bot 2021-8-20
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?

请先登录，再回答此问题。

回答（1 个）

Maitreyee Mordekar
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.

标签

Community Treasure Hunt

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

Start Hunting!

Translated by