number of a row in an array

#1 Publicado: 26/3/2021 23:40:35

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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 Publicado: 27/3/2021 0:33:17

NDTM Amarasekera

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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

A 2 usuarios les gustó este mensaje

Erick Valentino 6/5/2021 7:32:00, Oscar Campo 10/5/2024 19:12:00

#3 Publicado: 27/3/2021 7:32:48

NDTM Amarasekera

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

Find_Row_Num.sm (95,29 KiB) descargado 1622 vez(es).

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

A 3 usuarios les gustó este mensaje

sergio 27/3/2021 8:42:00, Erick Valentino 6/5/2021 7:32:00, Oscar Campo 10/5/2024 19:12:00

#4 Publicado: 27/3/2021 8:33:47

Jean Giraud

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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) descargado 1374 vez(es).
Utilities Matrix Locate Array1 Array2.sm (70,25 KiB) descargado 1588 vez(es).
Utilities Matrix Truth Table [Locate row_col] COMPANION.sm (153,6 KiB) descargado 1485 vez(es).
Utilities Matrix Treasury_1.sm (423,07 KiB) descargado 1634 vez(es).

A 1 usuarios les gustó este mensaje

Erick Valentino 6/5/2021 7:32:00

#5 Publicado: 6/5/2021 7:35:13

Erick Valentino

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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 Publicado: 6/5/2021 8:21:02

Martin_B

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Alternative (needs special functions plugin):

Or in one line:

#7 Publicado: 6/5/2021 9:49:36

Jean Giraud

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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 Publicado: 27/7/2023 16:04:49

Beyaz

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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 Publicado: 27/7/2023 22:14:46

overlord

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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) descargado 1546 vez(es).

#10 Publicado: 28/7/2023 9:27:38

Jean Giraud

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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) descargado 1555 vez(es).
Utilities Matrix FindIndex DUAL COMPANION Copy.sm (108,1 KiB) descargado 1821 vez(es).
Utilities Matrix FindIndexKey COMPANION QUICK Copy.sm (89,52 KiB) descargado 1665 vez(es).
Utilities Matrix FindIndexKey COMPANION QUICK.sm (89,51 KiB) descargado 1614 vez(es).

#11 Publicado: 28/7/2023 16:32:39

Beyaz

0 me gusta en 19 mensajes.

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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) descargado 1546 vez(es).

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) descargado 1690 vez(es).

//I solved it like this

#12 Publicado: 28/7/2023 17:03:03

overlord

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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 Publicado: 29/7/2023 8:22:05

Jean Giraud

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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 Publicado: 5/1/2024 16:37:40

Beyaz

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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) descargado 1636 vez(es).

#15 Publicado: 6/1/2024 3:48:08

Martin Kraska

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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.

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