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Jan 21, 2018 3:17 PM
(2452 views)

Hi,

I would like to use for loop to delete my columns. Below is an example but I have more columsn.

Also, how you treat columns with white space in between like "color size".

Thanks.

dt = Open( "$SAMPLE_DATA\Big Class.jmp" );
column_list = Words( "heigth", "weight" );
For( i = N Items( column_list ), i > 0, i--,
dt << Select Where( :column_list[i] > 67 );
dt << delete rows;
);

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I am not sure what you are actually asking for. Therefore, I am including 2 different scripts. The first one deletes all of the rows that meet your condition of values > 67. When you delete rows, it deletes the entire row, so the results of this script deletes all but 2 rows.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\Big Class.jmp" );
column_list = {"height", "weight"};
For( i = N Items( column_list ), i > 0, i--,
dt << Select Where( as column(column_list[i]) > 67 );
dt << delete rows;
);
```

But what I think you might be trying to do, is to eliminate the values in the columns where the value of height and weight are > 67. This script replaces the values of height and weight with missing values.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\Big Class.jmp" );
column_list = {"height", "weight"};
For( i = N Items( column_list ), i > 0, i--,
SelectedRows = dt << get rows Where( as column(column_list[i]) > 67 );
column(column_List[i])[Selected Rows] = .;
);
```

Jim

1 REPLY 1

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I am not sure what you are actually asking for. Therefore, I am including 2 different scripts. The first one deletes all of the rows that meet your condition of values > 67. When you delete rows, it deletes the entire row, so the results of this script deletes all but 2 rows.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\Big Class.jmp" );
column_list = {"height", "weight"};
For( i = N Items( column_list ), i > 0, i--,
dt << Select Where( as column(column_list[i]) > 67 );
dt << delete rows;
);
```

But what I think you might be trying to do, is to eliminate the values in the columns where the value of height and weight are > 67. This script replaces the values of height and weight with missing values.

```
Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA\Big Class.jmp" );
column_list = {"height", "weight"};
For( i = N Items( column_list ), i > 0, i--,
SelectedRows = dt << get rows Where( as column(column_list[i]) > 67 );
column(column_List[i])[Selected Rows] = .;
);
```

Jim