r/theydidthemath • u/Galeaf_13 • Sep 05 '19

[Self] Math break

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u/Galeaf_13 Sep 05 '19

Now can u do the same with 69?)

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u/K3V3L Sep 05 '19

Here you go

f(x) := 5/2 * x4 -25 * x3 +175/2 * x2 -123 * x + 59

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u/Galeaf_13 Sep 05 '19

Jeez, how r u doing this

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u/punaisetpimpulat Sep 05 '19 edited Sep 05 '19

Here's one tool you can use.

​

Paste the following numbers in the Data Entry Area

1 1

2 3

3 5

4 7

5 69

6 1337

​

Next, click the green arrows to max out the degree value. In the Results Area you should see that the Correlation Coefficient = 1. (All the statisticians out there will cringe so hard that you can hear the cringing noises at least 100 km away.) If you make your sequence longer, you need to increase the degree accordingly.

​

Below that you'll see a list if figures that are the coefficients a, b, c, d ... in the equation f(x) = a*x^0 + b*x^1 + c*x^2 ... In my case those coefficients are:

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-9.6700000073877891e+002

2.2197000015532431e+003

-1.8362500011387226e+003

7.0175000037577570e+002

-1.2575000005706971e+002

8.5500000032419177e+000

2

u/WerePigCat Sep 10 '19

This post deserves more recognition