number of a row in an array

#1 Опубликовано: 26.03.2021 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

[albumimg]1629[/albumimg]

#2 Опубликовано: 27.03.2021 00:33:17

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

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Erick Valentino 06.05.2021 07:32:00, Oscar Campo 10.05.2024 19:12:00

#3 Опубликовано: 27.03.2021 07:32:48

NDTM Amarasekera

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

Find_Row_Num.sm (95 КиБ) скачан 57 раз(а).

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

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sergio 27.03.2021 08:42:00, Erick Valentino 06.05.2021 07:32:00, Oscar Campo 10.05.2024 19:12:00

#4 Опубликовано: 27.03.2021 08:33:47

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 КиБ) скачан 40 раз(а).
Utilities Matrix Locate Array1 Array2.sm (70 КиБ) скачан 33 раз(а).
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Utilities Matrix Treasury_1.sm (423 КиБ) скачан 33 раз(а).

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Erick Valentino 06.05.2021 07:32:00

#5 Опубликовано: 06.05.2021 07:35:13

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 Опубликовано: 06.05.2021 08:21:02

Martin_B

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Alternative (needs special functions plugin):

Or in one line:

#7 Опубликовано: 06.05.2021 09:49:36

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 Опубликовано: 27.07.2023 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 Опубликовано: 27.07.2023 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 КиБ) скачан 31 раз(а).

#10 Опубликовано: 28.07.2023 09:27:38

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 КиБ) скачан 28 раз(а).
Utilities Matrix FindIndex DUAL COMPANION Copy.sm (108 КиБ) скачан 24 раз(а).
Utilities Matrix FindIndexKey COMPANION QUICK Copy.sm (89 КиБ) скачан 26 раз(а).
Utilities Matrix FindIndexKey COMPANION QUICK.sm (89 КиБ) скачан 28 раз(а).

#11 Опубликовано: 28.07.2023 16:32:39

Beyaz

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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 КиБ) скачан 31 раз(а).

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 КиБ) скачан 25 раз(а).

//I solved it like this

#12 Опубликовано: 28.07.2023 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 Опубликовано: 29.07.2023 08:22:05

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 Опубликовано: 05.01.2024 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 КиБ) скачан 22 раз(а).

#15 Опубликовано: 06.01.2024 03:48:08

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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Martin Kraska Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

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