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Not sure what to do on this question.

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Brian
Brian 2013-3-26
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.

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回答（3 个）

Walter Roberson
Walter Roberson 2013-3-26
was the input 1? If so then plot cos(x). Wss the input 2? If so then plot sin(x). And so on.
  2 个评论
Brian
Brian 2013-3-26
no its function 1, function 2, function 3. The numbers aren't inputs.
Walter Roberson
Walter Roberson 2013-3-26
"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.

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Image Analyst
Image Analyst 2013-3-26
编辑：Image Analyst 2013-3-26
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.
Youssef Khmou
Youssef Khmou 2013-3-26
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
  2 个评论
Youssef Khmou
Youssef Khmou 2013-3-26
编辑：Youssef Khmou 2013-3-26
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
Image Analyst 2013-3-26
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.

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