find

Syntax

find(X, Y)

Arguments

X is a vector/dictionary/keyed table/indexed table.

Y is a scalar/vector.

Details

If X is a vector: for each element of Y, return the position of its first occurrence in vector X. If the element doesn’t appear in X, return -1. (To find the positions of all occurences, please use function at.)

If X is a dictionary: for each element of Y, if it is a key in X, return the corresponding value in X; if it is not a key in X, return NULL.

If X is a keyed table or indexed table: for each element of Y, return the position of its first occurrence in the key columns of X. If the element doesn’t appear in the key columns of X, return -1.

To search for a small amount of data in a sorted vector, we recommend to use function binsrch. Please also check the related function in.

Examples

When X is a vector:

$ find(7 3 3 5, 3);
1

$ at(7 3 3 5 == 3);
[1,2]

$ (7 3 3 5 6).find(2 4 5);
[-1,-1,3]

When X is a dictionary:

$ z=dict(1 2 3,4.5 6.6 3.2);
$ z;
3->3.2
1->4.5
2->6.6

$ find(z,3);
3.2
$ find(z,5);
00F

When X is a keyed table or an indexed table:

$ kt = keyedTable(`name`id,1000:0,`name`id`age`department,[STRING,INT,INT,STRING])
$ insert into kt values(`Tom`Sam`Cindy`Emma`Nick, 1 2 3 4 5, 30 35 32 25 30, `IT`Finance`HR`HR`IT)
$ find(kt,(`Emma`Sam, 4 1));
[3,-1]

$ t1 = indexedTable(`sym`side, 10000:0, `sym`side`price`qty, [SYMBOL,CHAR,DOUBLE,INT])
$ insert into t1 values(`IBM`MSFT`GOOG, ['B','S','B'], 10.01 10.02 10.03, 10 10 20)
$ find(t1, (`GOOG`MSFT, ['B','S']))
[2,1]