My function wont work?

Whats wrong with this function? it keep ssayinf variables are undefined.

% thsi is the function I wrote

 function [maxheight, time, speed] = cannon(x0, y0, v0,angle)
maxheight=(v0^2*sin(angle)^2)/(2*9.8)
time=v0*sin(angle)/9.8
speed=cos(angle)*v0
endfunction

%this is the code given by the professor
x0 = 0;
y0 = 0;
v0 = 20; % initial speed in m/s 
angle = 45; % elevation angle in degrees
[maxheight,time,speed] = cannon(x0,y0,v0,angle);
fprintf('The max height is %7.2f \n' , maxheight)
fprintf('The time of the max height is %7.2f seconds \n' , time)
fprintf('The speed at the max height is %7.2f \n' , speed)

Answer 1

[Image Analyst]

Get rid of "endfunction" and it will run fine. Copy this (both functions) into a file called test.m and run it:

function test
%this is the code given by the professor
x0 = 0;
y0 = 0;
v0 = 20; % initial speed in m/s 
angle = 45; % elevation angle in degrees
[maxheight,time,speed] = cannon(x0,y0,v0,angle);
fprintf('The max height is %7.2f \n' , maxheight)
fprintf('The time of the max height is %7.2f seconds \n' , time)
fprintf('The speed at the max height is %7.2f \n' , speed)

function [maxheight, time, speed] = cannon(x0, y0, v0,angle)
maxheight=(v0^2*sin(angle)^2)/(2*9.8)
time=v0*sin(angle)/9.8
speed=cos(angle)*v0

It will run fine.

[Image Analyst]

So did you try it and verify that this works?

Answer 2

[sami]

1) Open matlab-> create new m-file

copy-paste this : function [maxheight, time, speed] = cannon(x0, y0, v0,angle)

maxheight=(v0^2*sin(angle)^2)/(2*9.8);

time=v0*sin(angle)/9.8;

speed=cos(angle)*v0;

 end

Ctrl+S (to save it) save it as it is (autodetection of the name of the function is the same as the name of the file.

2) create another new m-file :

copy paste this :

clear all;clc

%this is the code given by the professor x0 = 0; y0 = 0; v0 = 20; % initial speed in m/s angle = 45; % elevation angle in degrees [maxheight,time,speed] = cannon(x0,y0,v0,angle); fprintf('The max height is %7.2f \n' , maxheight) fprintf('The time of the max height is %7.2f seconds \n' , time) fprintf('The speed at the max height is %7.2f \n' , speed)

Ctrl+S (give it a name)

Then run it.

RESULT

The max height is 14.78 The time of the max height is 1.74 seconds The speed at the max height is 10.51

END OF RESULT

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Manopka]

thank you. this is what i was doing wrong.

the professor told us to paste his code into our file but thats only for when we turn it in.

Answer 3

[per isakson]

"it keep ssayinf variables are undefined". What is the exact error message?

I cannot guess what you are doing to produce an error

Running this script

    %%this is the code given by the professor
        x0 = 0;
        y0 = 0;
        v0 = 20; % initial speed in m/s
        angle = 45; % elevation angle in degrees
        [maxheight,time,speed] = cannon(x0,y0,v0,angle);

        fprintf('The max height is %7.2f \n' , maxheight)
        fprintf('The time of the max height is %7.2f seconds \n' , time)
        fprintf('The speed at the max height is %7.2f \n' , speed)

prints the following in the command window

    The max height is   14.78 
    The time of the max height is    1.74 seconds 
    The speed at the max height is   10.51

where

    function [ maxheight, time, speed] = cannon( x0, y0, v0, angle )
        maxheight=( v0^2*sin(angle)^2)/(2*9.8);
        time=v0*sin(angle)/9.8;
        speed=cos(angle)*v0;
    end

The input arguments, x0 and y0, are not used.