Matlab evaluate function at a point. Jan 20, 2014 · For example, if I have a function f(x)=x^2, how can I evaluate it at x=2? I have tried employing the symbolic toolbox and using the following code in the Command Window: Use evaluate to find the numeric value of an optimization expression at a point, or to find the values of objective and constraint expressions in an optimization problem, equation problem, or optimization constraint at a set of points. This MATLAB function evaluates a function using its name or its handle, and using the input arguments x1,,xM. In this video, learn how to display the output of a function given specific inputs using feval. Oct 23, 2021 · I have to write Matlab function:function value = evaluate (f,x,y,n) that evaluates value of real function f on equidistant array of n points on segment [x,y]. But if the number of variables are very large like say 100 then how to evaluate this function? Manual entry of 100 variables (like: f (1,1) or feval (f,1,1) ) is time consuming and condition gets worse in the iterations where the number of variables may change. This MATLAB function returns a vector containing the linear indices of each nonzero element in array X. This guide simplifies curve fitting, giving you quick insights for your data analysis. Now I want to evaluate it at specific point. I have computed special points (the minimum) of this family of equations. Function has to return vector of dimension 2xn, such that in first row are points from equidistant array, and in second row is function value in those points. Evaluate Function at different data points from Learn more about evaluate function I have expanded sin function into a Taylor series. Invoking feval with a function handle is equivalent to invoking the function handle directly. However f (1,1) or feval (f,1,1) evaluates the value of function at given points. It evaluates the polynomial let's p at the points in x and it returns the corresponding function values in y . I am taking the derivative of cos(x)-x, and then using subs to evaluate it at a point, but instead of getting an answer it returns me this: syms x func = @ This MATLAB function evaluates the polynomial p at each point in x. I get strange "MuPAD" errors in matlab. Example: fun = 'cos' Example: fun . The function accepts M input arguments, and returns N output arguments. An example would be 1*sin (1*x) and 2*sin (2*x). To specify fun as a function name, do not include path information. The syntax for polyval is as follows: Syntax: y = polyval (p,x) %returns the value of a polynomial of degree n evaluated at x Where is a vector of coefficients representing a Functions return values based on inputs you provide. Apr 28, 2025 · polyval is a built-in function in MATLAB that allows you to evaluate a polynomial at a specific point. Function to evaluate, specified as a function name or a handle to a function. `csape`: This function fits a cubic spline that allows for additional boundary conditions and variational splines. I would like to be able to evaluate each equation within the family at the special point for that specific equation. For example, if I define the following in Matlab, f(x) = x^2 + 3x - 2 How do I find what value the function evaluates to when x = 3? This MATLAB function evaluates the MATLAB code in expression. Oct 28, 2023 · I have a function that is a family of similar but different functions. When I try, I get a n-by-n sym array, because Matlab evaluates each equation at the special point for each equation, instead of evaluating each equation at the special point of that equation. Discover the power of the polyfit function in MATLAB. When I try, I get a n-by-n sym array, because Matlab evaluates each equation at the Basic Commands for Spline Fitting Key MATLAB functions for spline fitting include: `spline`: This function calculates the piecewise polynomial interpolation for given data points. I was wondering if anyone can help. What am I doing wrong? function r1=taylor_sine syms x; mysin evaluating a function at different points Asked 8 years, 6 months ago Modified 8 years, 6 months ago Viewed 78 times Evaluate expressions and functions after their variables are assigned values. 9uvlre, 4ojq, lnkva, ujmub, u8wu, kvn5s, bdiwf, ib05g, dz1l, zysyc,