I have one formula where it is necessary to make a sum in a way that takes into account 5 coefficients of a polynomial. In the sum he is marked as ak and I need that instead of ak there was a1..a2..a3 ... a4 ... a5. Also, for each polynomial account, the power K automatically changes from the index of the polynomial 1..2..3..4..5. How to implement it in this program? Also, I have several layers of reinforcement in the equation that should also be instead of Asi to As1...As2...As3...Asn and Sigma_si to Sigma_s1...Sigma_s2...Sigma_s3...Sigma_sn . Sorry for bad English.


Arkush1.sm (11 KiB) downloaded 84 time(s).

You made the following error: you used "a.k" instead of "a[k". This way you did not create vectors to use in the summation with the counter. You need to do to define and then use As and Sigmas.

sergio

I corrected a.k for a[k but how do I set 5 values for one variable a[k?

for example a[1:=2.5 a[2:=3.21 a[3:=-7.1
so "a" is a vector
in the sum a[k

sergio

Unable to determine the value of an element since the item with the specified index does not exist -error

Arkush1.sm (14 KiB) downloaded 80 time(s).

Solution




Arkush1_CBG.sm (15 KiB) downloaded 90 time(s).



Best Regards


Carlos

... you may clean/recast a bit.

Arkush1_CBG.sm (13 KiB) downloaded 84 time(s).

Wrote

... you may clean/recast a bit.

You have 11 sets of 'a'
Easy to tabulate, is it what you want ?

Pl look at this. Error may have occurred when entering the formula???? Difficult to trace.
Unable to select individual components of the erroneous formula.



Arkush1_ndtma.sm (16 KiB) downloaded 85 time(s).

Wrote

You have 11 sets of 'a'
Easy to tabulate, is it what you want ?

Arkush1_CBG [data].sm (136 KiB) downloaded 92 time(s).

Wrote

Pl look at this. Error may have occurred when entering the formula???? Difficult to trace.
Unable to select individual components of the erroneous formula.

There it seems the formula is ill posed wrt [4.1].
It shows bfcd as something not defined but the originator
has defined b, and defined fcd ... b*fcd.