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Stuck with one program

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Gimmy Morales
Gimmy Morales 2013-8-29
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
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Gimmy Morales
Gimmy Morales 2013-8-29
编辑：Walter Roberson 2013-8-29
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
Walter Roberson 2013-8-29
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()

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Walter Roberson
Walter Roberson 2013-8-29

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David Sanchez
David Sanchez 2013-8-29
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);
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Walter Roberson
Walter Roberson 2013-8-29
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.

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