Least Square fitting using Scilab: straight line fitting and polynomial fitting

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Least Square Method is used to demonstrate the fitting of data using Scilab. With the help of examples and code data is fitted to a straight line and to a polynomial of degree 2.
link for simultaneous linear equations is:
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Maam pls finite difference method pr video upload kre

yashikasarawat
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I am not getting the line on execution but getting the points to do maam?

secularbanda
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Mam in step 17 why you had write the range (-10 to10) in this manner -10:0.1:10?

AnjaliSingh-bbig
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Mam please explain here why you wrote -4 with x and y in step 4

AnjaliSingh-bbig
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Ma'am why are we using "plot" for the straight line and "plot2d" for the data points??

gaurangkuksal
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I think, in second and third summation equations n should be c.

serkansozen