Projectile as a height handle, fzero used as a function of function to find hitting ground, syntax> fzero(function_handle, x_guess) guess by user hitting ground

clc; clear all; close all;

% height_handle = @(t) height(t)

height_handle = @(t) -(9.8./2)*t^2+125*t+500

fplot(height_handle,[0,60])

x_guess=input('Enter a value when it will hit ground:')

% abs_height_handle=mod(height_handle) % tried abs(height_handle) does not

% work

function_handle=fzero(abs_height_handle,[0,60])

fzero(function_handle, x_guess)

ground=fzero(function_handle, 40)

% get the following errors

Error in Untitled2 (line 6)

abs_height_handle=mod(height_handle) % tried abs(height_handle) does not

Answer 1

[Harsha Priya Daggubati]

Hi,

It is advised to clearly explain your issue as text instead of title. Also leverage using code section to post your code. I assume your issue is in line 6. It is because the declared function handle height_handle, expects an input argument whenever a call is made. The following link might help you understand function handles better.

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

You can correct your call such that you pass an argument.

abs_height_handle= mod(height_handle(x_guess)) %I guess you should pass x_guess! 

Also, mod expects two input arguments 'a' and 'm'. You can look into the following documentation link and figure out which method out of mod and abs to use.

https://www.mathworks.com/help/matlab/ref/mod.html

Hope this solves your issue!

[davood Ostadalipoor]

Thank you