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How i can write this formula in Smath Studio? - How i can write this formula in Smath Studio? - Messaggi

#1 Pubblicato: 18/05/2018 10:05:41
yuriy1996

yuriy1996

0 apprezzamenti in 11 post.

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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.
Screenshot_1.png
Screenshot_2.png
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#2 Pubblicato: 18/05/2018 10:32:44
sergio

sergio

127 apprezzamenti in 342 post.

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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
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yuriy1996 18/05/2018 11:16:00
#3 Pubblicato: 18/05/2018 10:38:06
yuriy1996

yuriy1996

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I corrected a.k for a[k but how do I set 5 values for one variable a[k?
#4 Pubblicato: 18/05/2018 10:55:32
sergio

sergio

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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
1 utenti hanno apprezzato questo post
yuriy1996 18/05/2018 11:15:00
#5 Pubblicato: 18/05/2018 11:13:48
yuriy1996

yuriy1996

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Unable to determine the value of an element since the item with the specified index does not exist -error
#6 Pubblicato: 18/05/2018 11:16:25
yuriy1996

yuriy1996

0 apprezzamenti in 11 post.

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#7 Pubblicato: 18/05/2018 11:46:35
CBG

CBG

78 apprezzamenti in 312 post.

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Solution

Solution_Formula.png


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Best Regards


Carlos
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yuriy1996 18/05/2018 11:49:00
#8 Pubblicato: 18/05/2018 12:29:55
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

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... you may clean/recast a bit.

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#9 Pubblicato: 18/05/2018 13:18:18
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

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Wrote

... you may clean/recast a bit.



You have 11 sets of 'a'
Easy to tabulate, is it what you want ?
#10 Pubblicato: 18/05/2018 13:51:50
NDTM Amarasekera

NDTM Amarasekera

130 apprezzamenti in 352 post.

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

Formula Format.jpg

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Look within!... The secret is inside you. Best Regards Eng. NDTM Amarasekera - Sri Lanka
#11 Pubblicato: 18/05/2018 14:53:49
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

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Wrote

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



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#12 Pubblicato: 18/05/2018 21:34:10
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

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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.

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