chebfun coefficient reconstruction from initial value

fima v

2017 7 6

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Hello i have an initial Chebychev coefficient of X0=1.853 from which i have to get the other coeeficient 40.507, 172.277 , 355.499 , 445.373

i have downloaded the chebfun functions and tried to use chebpolyval(4,1) and i cant get those values, what function shown i use in order to recreate this result?

Thanks

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John D'Errico 2017-7-6

编辑：John D'Errico 2017-7-6

Huh? I think you should try asking this question a bit more clearly.

https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

fima v 2017-7-7

编辑：fima v 2017-7-7

i need to recreate these chebychev coefficents given the initial value of X_0=1.853 as shown in the photo bellow. i have tried to follow the iterrative algorithm shown in the photo bellow. please help me understand where did i go wrong?

Thanks

if x_0=1.853 then T_0=1 T_1=1.853 T_2=2*1.853*1.853-1 its not the same numbers that they get in the article </matlabcentral/answers/uploaded_files/82373/Capture.JPG>