how to enter this transfer function?

[cigua]

hi all, wonder how to enter this transfer function, tried diferent ways and always get error from matlab, using simulink and tf([num,den]), any help will be thanksfull

(k.s2+4s+k)/(s4+2s3+3)

see attached picture of the closed loop exercise,
thanks

 

[xnuke]

Is this for school?

xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[IRstuff]

One would think that the actual source code that's not working would have been presented. Do you think that we are all mind readers?

TTFN
faq731-376

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