Stuck with one program

Hello, well I'm new using Matlab and is really awesome. I'm stuck with this exercise. Thanks for the help(:

13)    A particle, initially at rest, is subjected to an applied force F.

   For time  t between  0 and a  Time T       F  =  Fm  (1 -  ((t – T)/T) )^2

   For  time t > T          F = Fm          

a) Write  a script (Editor) file  that requests  the values  of   Fm,  T, and t as input,  and displays the value of F.

b) Plot  F vs t    use the values of  Fm = 5,   T = 10,  t [0 – 20]
Create the  variables  xmax = 20  and  ymax = F(1)   and  controls the graph axis using the command:

    axis([0   xmax   0     ymax])
  % this command goes after the plot command

Use SI units.   
Call this program  xxx_section_F3.m  where xxx  are your initials and substitute the section word by the section number that are 08 or 22.

  Hint:   create the  t vector with linspace as example:
    t = linspace(0,  20, 200)
for  n = 1: 200;
   F(n) = …..     %  when n=1 create F(1), when n = 2 create F(2), when n = 3 create F(3) and so on.  You must use  if command  inside the for command

[Walter Roberson]

Please be more specific about what you are stuck on. Is your code producing an error message?

[Gimmy Morales]

Yes. I dont have an instructor for now, so I want to learn by myself.

This is what I got, I started to numbered the variables given

Fm=5;    T=0;    
t= linspace(0, 20, 200);  
F  =  Fm  (1 -  ((t - T)/T) )^2

for t= 1:200

      if t <=0 
          F = (1 -  ((t - T)/T) )^2  
      else t > T  
          F = Fm
      end          
  end
  plot(t*200, F);

[Walter Roberson]

The first thing you are asked to do in the assignment is,

Write  a script (Editor) file  that requests  the values  of   Fm,  T, and t as input,  and displays the value of F.

Your code does not request values for those variables. Refer to input()

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/8026-best-way-s-to-master-matlab

Answer 2

[David Sanchez]

I wrote the first part of your exercise, try to do the rest yourself:

Fm = input('value of Fm? ');
T = input('value of T? ');
t = input('value of t?');

if (t<T & t>0)
    F  =  Fm *(1 -  ((t - T)/T) ).^2; 
elseif t>T
    F = Fm;
end
 fprintf('F = %g \n', F);

[Walter Roberson]

In that code if t == T then F will be left undefined. The same will be true if t < T but t <= 0.

I do note that the original question leaves those cases undefined.