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Student asking for help(simple stuff)

Asked by avantic on 30 Jan 2013

How can I do following in matlab?

1)Draw the graph of the function y = tan (x) / x dotted red in the interval (-3.3) with a hundred points

2)Find the roots of polynomials y =-3x^3+4x^2-x+3

3)Solve the system of equations:

x-y+2z=1

x-2y-z=2

3x-y+5z=3

4) Find a graph of the function y= (xe^-x)/1-e^x,,,,,,,,,on intervale(-5.5) with step 00:01

 Any help with this would be highly appreciated, thanks in advance.

Regards.

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avantic

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1 Answer

Answer by Shashank Prasanna on 30 Jan 2013
Edited by Shashank Prasanna on 30 Jan 2013
Accepted answer

Sounds like an assignment. Please read the getting started guide. And use the doc heavily.

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html?s_tid=doc_12b

1) Plot: http://www.mathworks.com/help/matlab/ref/plot.html

2) ROOTS: http://www.mathworks.com/help/matlab/ref/roots.html

3) Do you want to vizualize? what do you want to do when you say find a graphs? Use plot again just to observe.

Hint for 1:

x = linspace(-3,3,100);
plot(x,tan(x)./x,'r.');

1 Comment

avantic on 30 Jan 2013

Thanks for your help. This is all I needed ( I know I should google better but w/e now :P ). Regards.

Shashank Prasanna

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