Not sure what to do on this question.

write a matlab script that allowss the user to plot one to plot one of the following functions over the range 0 less than or equal to x equal to or less than 10. x<=x<=10

f1(x)=cos(x)

f2(x)=sin(x)

f3(x)=(-x^2)+10x

Using the input command, your script should ask the user to select which function to plot. Then , the script should generate the desired plot.

I'm not really sure what i'm supposed to do for this problem, the things covered in the book seem a bit vague to me.

Answer 1

[Walter Roberson]

was the input 1? If so then plot cos(x). Wss the input 2? If so then plot sin(x). And so on.

[Brian]

no its function 1, function 2, function 3. The numbers aren't inputs.

[Walter Roberson]

"your script shuld ask the user to select which function to plot". That does not say that you must allow the user to use a string answer to make the selection.

Answer 2

[Image Analyst]

I would use the menu function:

button = menu('Select one',...
'f1(x)=cos(x)',...
'f2(x)=sin(x)',...
'f3(x)=(-x^2)+10x')
if button == 1
  % Plot function 1
elseif button == 2
  % Plot function 2
else
  % Plot function 3
end

But if it requires the input() function, there are examples in the help for that, which you should easily be able to adapt.

Answer 3

[Youssef Khmou]

hi, try his basic sol :

 % SCRIPT

 x=0:0.1:10;

 fprintf(' SELECT A FUNCTION TO PLOT :\n case1 : cos(x) \n case(2) sin(x) .\n  case (3) : -x^2+10x :\n');
 a=input('');

 if a==1

    figure, plot(x,cos(x));

 elseif a==2

    figure, plot(x,sin(x));
 elseif a==3

    figure, plot(x,-x.^2+10*x);
 end

[Youssef Khmou]

you should add another input for resolution or step dx , and also the lower and upper limits , its easy i think .

 fprintf(' enter step dx \n');
 .....
 dx=input('');

 .............

[Image Analyst]

You don't need the figure command - plot will automatically create a figure. And usually we don't do the entire homework for them - we leave at least something for them to do.