Mar 20, 2012 · If all you'll ever work with are polynomials, however, this is a special enough case that you should be able to write a general Matlab function that takes in a coefficient list and a range of values as input, and outputs the derivative coefficient list plus the derivative function evaluated at those values. Here's an example:

Does it matter to you that your derivative is evaluated on the same points as your function is defined? MATLAB provides the diff function to compute differences between adjacent array elements. This can be used to calculate approximate derivatives via a first-order forward-differencing (or forward finite difference ) scheme, but the estimates ...

Jan 14, 2011 · This should be very simple. I have a function f(x), and I want to evaluate f'(x) for a given x in MATLAB. All my searches have come up with symbolic math, which is not what I need, I need numerical

Jun 28, 2016 · I have seen on this forum that I am not the only one trying to calculate the first derivative of a function with matlab. But since, I don't know the mathematical formula of my function, I can't use the symbolic Math Toolbox. So my questions are: How can I calculate the derivative of a function in matlab by only knowing its inputs and outputs?

May 4, 2015 · In the above link, you will find a function that requires string 'sin(x^2)' as input and gives you something like 'cos(x^2)*2*x' (i.e. also a string). You may then use standard Matlab's eval() to evaluate the derivative numerically at any x point.

Dec 23, 2014 · If you have the MATLAB Symbolic Toolbox, you can calculate the symbolic derivatives. Note that the functions are still called diff, but these are different functions! For details compare the help pages of the MATLAB Diff and the Symbolic Diff functions. syms x f = exp(x) - 2*x - 2; df = diff(f); ddf = diff(df);

Apr 19, 2015 · I am following the below steps to calculate the second derivative of a function using MATLAB-syms a b; th ...

Mar 17, 2018 · Assuming that you want to do symbolic derivatives and assuming that t is the independent variable, h is some constants, and x, y, and a are functions of t, you can do:

Jan 26, 2013 · I was using matlab a lot to help me with math problems. Right now I am looking for a way to do implicit differentiation in matlab. For example, I would like to differentiate y^3*sin(x)+cos(y)*exp(x)=0 with respect to dy/dx. I am aware how to do this normally using math methods, but I was struggling to find the easy way with matlab.

Oct 27, 2013 · I would like to calculate the derivative of the following function in Matlab in point x=1.0: v = sin(x)+ cos(3*x) I tried this but it returns py = [] sym x, x=1.0, y=sin(x) + cos(3*x), py=diff(y);