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

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davood Ostadalipoor
评论： davood Ostadalipoor 2020-5-26
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

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Harsha Priya Daggubati
编辑：Harsha Priya Daggubati 2020-5-15
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!

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