tf command not working correctly

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Grace Normoyle 2020-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/514425-tf-command-not-working-correctly

评论： Adam Danz 2020-4-1

Hello,

I am not sure why this is happening. I ran this command in MATLAB

sys=tf([4],[1 2 0])

and got this as the answer.

sys =

s^20 + 1.5 s^19 + 2 s^18 + 2.5 s^17 + 3 s^16 + 3.5 s^15

+ 4 s^14 + 4.5 s^13 + 5 s^12 + 5.5 s^11 + 6 s^10

+ 5.5 s^9 + 5 s^8 + 4.5 s^7 + 4 s^6 + 3.5 s^5

+ 3 s^4 + 2.5 s^3 + 2 s^2 + 1.5 s + 1

--------------------------------------------------------------

s^20 + 1.5 s^19 + 2 s^18 + 2.5 s^17 + 3 s^16 + 3.5 s^15

+ 4 s^14 + 4.5 s^13 + 5 s^12 + 5.5 s^11 + 6 s^10

+ 5.5 s^9 + 5 s^8 + 4.5 s^7 + 4 s^6 + 3.5 s^5

+ 3 s^4 + 2.5 s^3 + 2 s^2 + 1.5 s + 1

This is not the correct answer to the transfer function.

Do you know what I can do to fix this?

Thank you

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Grace Normoyle 2020-3-31

在 MATLAB Online 中打开

When I open the MATLAB I get these errors.

Unable to perform assignment because the left and right sides have a different number of elements.
Error in matlab.internal.builtinhelper.repmat (line 53)
            siz(idx) = double(full(checkSizesType(arg)));
Error in matlab.supportpackagemanagement.internal.getInstalledSupportPackagesInfo (line 15)
    installedSupportPackages = repmat( ...
 
Unable to perform assignment because the left and right sides have a different number of elements.
Error in matlab.internal.builtinhelper.repmat (line 53)
            siz(idx) = double(full(checkSizesType(arg)));
Error in matlab.internal.addons.updates.getSupportPackageUpdates (line 23)
    supportPackageUpdates = repmat( ...

Adam Danz 2020-4-1

See this thread. There are two different answers. Try the accepted answer first. If that doesn't work, try the 2nd answer. If neither work, contact MathWorks support.

https://www.mathworks.com/matlabcentral/answers/480811-2019b-installation-problem

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