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- Finding row index as a number

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Jan 13, 2016 10:27 AM
(998 views)

hi all.

I need to find row index when column2 =0

and then use the row number in subset.

when I use "select where" or "get where" it doesn't give me the index as a number.

dt<<**get rows where****(** :column **(2)**==0**)**;

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Solution

Your result indicates there were no rows meeting your criteria. If you know there are rows with 0 in them, it may be that your column is character data type and the comparison is numeric... either put quotes around 0 in your comparison, or change the data type of the column to Numeric.

5 REPLIES

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Jan 13, 2016 11:54 AM
(763 views)

Slight modification to your syntax:

rmat = dt << **get rows where** **(**as column**(2)** == **0)**;

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Jan 13, 2016 11:56 AM
(763 views)

it shows:

rmat = [](0, 1);

what does this mean? I need just a number. for example 90. (means in row #90)

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Jan 13, 2016 1:41 PM
(763 views)

Run this:

dt=New Table**(** "example table",

Add Rows**(** **12** **)**, New Column**(** "A column", Numeric, "Continuous",

Set Values**(** **[****1**, **1**, **1**, **10**, **0**, **1**, **1**, **1**, **0**, **1**, **0**, **1****]** **)** **)****)**;

rmat = dt << **get rows where** **(**as column**(1****)** == **0****)**;

in the log you'll see this:

**[5, 9, 11]**

this is a list of rows where the first column was equal to 0;

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Jan 14, 2016 2:06 AM
(763 views)

rmat is a row matrix. To get the number of rows you can write **n = NRows(rmat)**. The first row number will be **rmat[1]**, the second **rmat[2]** up to** rmat**. If you want to look up corresponding values in another column, just for these rows you can write

-Dave

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