number of a row in an array

#1 Pubblicato: 26/03/2021 23:40:35

7 apprezzamenti in 29 post.

Gruppo: User

Hi guys

Do you know how to get the number of a row in an array?
ie I have a 5 * 2 array, I want to know what is the number of a particular row

¿Cómo se obtiene el número de una fila, de una matriz?
How do you get the number of a row, of a matrix?
I do not speak English, I hope you can understand me with the following image

#2 Pubblicato: 27/03/2021 00:33:17

NDTM Amarasekera

130 apprezzamenti in 352 post.

Gruppo: User

Hello Valentino!
This snippet downloaded from the forum long time back.
Credit to the author, but cannot remember.
There may be other short cuts too.

Cheers.....

Look within!... The secret is inside you. Best Regards Eng. NDTM Amarasekera - Sri Lanka

2 utenti hanno apprezzato questo post

Erick Valentino 06/05/2021 07:32:00, Oscar Campo 10/05/2024 19:12:00

#3 Pubblicato: 27/03/2021 07:32:48

NDTM Amarasekera

130 apprezzamenti in 352 post.

Gruppo: User

To find the indices of an array of values.
Cheers.....

Find_Row_Num.sm (95,29 KiB) scaricato 1628 volta(e).

Look within!... The secret is inside you. Best Regards Eng. NDTM Amarasekera - Sri Lanka

3 utenti hanno apprezzato questo post

sergio 27/03/2021 08:42:00, Erick Valentino 06/05/2021 07:32:00, Oscar Campo 10/05/2024 19:12:00

#4 Pubblicato: 27/03/2021 08:33:47

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Wrote
Do you know how to get the number of a row in an array?

These 4 are from a much larger compendium.
You will go a long route with them.
Jean

Utilities Matrix Truth Table [Locate row_col].sm (45,47 KiB) scaricato 1378 volta(e).
Utilities Matrix Locate Array1 Array2.sm (70,25 KiB) scaricato 1594 volta(e).
Utilities Matrix Truth Table [Locate row_col] COMPANION.sm (153,6 KiB) scaricato 1488 volta(e).
Utilities Matrix Treasury_1.sm (423,07 KiB) scaricato 1641 volta(e).

1 utenti hanno apprezzato questo post

Erick Valentino 06/05/2021 07:32:00

#5 Pubblicato: 06/05/2021 07:35:13

Erick Valentino

7 apprezzamenti in 29 post.

Gruppo: User

Wrote
Hello Valentino!
This snippet downloaded from the forum long time back.
Credit to the author, but cannot remember.
There may be other short cuts too.

Cheers.....

Thank you very much, it worked perfectly for me,
the method you teach is very useful.
Thanks for taking the time and sharing your ideas.

#6 Pubblicato: 06/05/2021 08:21:02

Martin_B

22 apprezzamenti in 84 post.

Gruppo: User

Alternative (needs special functions plugin):

Or in one line:

#7 Pubblicato: 06/05/2021 09:49:36

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Wrote
Do you know how to get the number of a row in an array?
i.e: I have a 5 * 2 array, I want to know what is the number of a particular row

#8 Pubblicato: 27/07/2023 16:04:49

Beyaz

0 apprezzamenti in 19 post.

Gruppo: User

hey,

i have a some problem.
i hope someone can solve this problem too.

in the first exampe "match" its not working but in the second example it works. i dont know why

#9 Pubblicato: 27/07/2023 22:14:46

overlord

600 apprezzamenti in 1.381 post.

Gruppo: Moderator

Wrote
hey,

i have a some problem.
i hope someone can solve this problem too.

in the first exampe "match" its not working but in the second example it works. i dont know why

Hi Beyaz,
For first warning, row() expect a real pure number for second argument.
Your findrows() result is a number with N unit.

Due to your second problem;
I think commas in your subscripts makes the bug.
When they are deleted, your function match() works.

Regards

PS: Please provide your problematic file next time.
Rewriting your entire screenshot is cumbersome.

match.sm (10,75 KiB) scaricato 1549 volta(e).

#10 Pubblicato: 28/07/2023 09:27:38

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

More utilities were designed and available.
These 4 will go a long route ... projects.
Created Studio, sanity checked Solver 30405.

Utilities Matrix Locate Array1 Array2.sm (70,46 KiB) scaricato 1560 volta(e).
Utilities Matrix FindIndex DUAL COMPANION Copy.sm (108,1 KiB) scaricato 1826 volta(e).
Utilities Matrix FindIndexKey COMPANION QUICK Copy.sm (89,52 KiB) scaricato 1672 volta(e).
Utilities Matrix FindIndexKey COMPANION QUICK.sm (89,51 KiB) scaricato 1617 volta(e).

#11 Pubblicato: 28/07/2023 16:32:39

Beyaz

0 apprezzamenti in 19 post.

Gruppo: User

Wrote

Wrote
hey,

i have a some problem.
i hope someone can solve this problem too.

in the first exampe "match" its not working but in the second example it works. i dont know why

Hi Beyaz,
For first warning, row() expect a real pure number for second argument.
Your findrows() result is a number with N unit.

Due to your second problem;
I think commas in your subscripts makes the bug.
When they are deleted, your function match() works.

Regards

PS: Please provide your problematic file next time.
Rewriting your entire screenshot is cumbersome.

match.sm (10,75 KiB) scaricato 1549 volta(e).

thanks overlord
sorry, you are right, next time i will add the file.

i tried it but it doesnt work. this time i add the file.
vogt.sm (636,54 KiB) scaricato 1695 volta(e).

//I solved it like this

#12 Pubblicato: 28/07/2023 17:03:03

overlord

600 apprezzamenti in 1.381 post.

Gruppo: Moderator

Your while loop shouldn't produce E.rkx.
At least my computer doesn't.
There should be an E.rkx output at end of it.

I would solve eval() problem like this.

Regards

#13 Pubblicato: 29/07/2023 08:22:05

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Attach an image of a typical 6 x 4 matrix 4 decimals.
From there, say what you want to extract.
That will ease the guidance, while avoiding confusion.

#14 Pubblicato: 05/01/2024 16:37:40

Beyaz

0 apprezzamenti in 19 post.

Gruppo: User

hey guys,

Your suggestions were very helpful, but is it possible to rewrite the function so that strings are also can be match.
Im looking for the Index of "b" ->[2]

KLED.sm (4,45 KiB) scaricato 1639 volta(e).

#15 Pubblicato: 06/01/2024 03:48:08

Martin Kraska

1.361 apprezzamenti in 2.275 post.

Gruppo: Moderator

The result of findrows() is a matrix, even if there is only one match (exept for no matches, then the result is the number zero)
Converting it to a scalar, seems to help. The same could be applied to the overall result to remove the matrix.

Yet, there is a shorter way to get the index. This, however, won't work for multiple matches.

File non trovato.File non trovato.

Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9

Forum SMath

number of a row in an array - HELP How do you get the number of a row, of a matrix? - Messaggi