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How to get columns names that contains certain words given by user?

ValarieSimmons

Hi,

I am looking for advice regarding getting columns that contains certain words that I am interested in.

For instance:

I would like to get any column names that contains "Number" in the given sample data provided below. Expected returned list of columns names should be {"Flight Number" , "Tail Number"}. However, I am not able to get anything returned. My codes are as follows:

dt = open("$SAMPLE_DATA/Air Traffic.jmp");
a= "Number";
col=dt<<get column names(string);
nc=nitems(col);
xxx={};
for(i=1,i<=nc,i++,
  if(contains(col,a),
  insert into(xxx,i);
  );
);

Any help or advice will be greatly appreciated! Thanks in advance!

Accepted answers

ian_jmp

Remember 'col' will be a list. So try:

dt = Open( "$SAMPLE_DATA/Air Traffic.jmp" );
a = "Number";
col = dt << get column names( string );
nc = N Items( col );
xxx = {};
For( i = 1, i <= nc, i++,
If( Contains( col[i], a ),
Insert Into( xxx, col[i] )
)
);

Print( xxx );

All comments

ian_jmp

Remember 'col' will be a list. So try:

dt = Open( "$SAMPLE_DATA/Air Traffic.jmp" );
a = "Number";
col = dt << get column names( string );
nc = N Items( col );
xxx = {};
For( i = 1, i <= nc, i++,
If( Contains( col[i], a ),
Insert Into( xxx, col[i] )
)
);

Print( xxx );

ValarieSimmons

Thank you, Ian!

Exactly the solution I'm looking for.

Best Regards,

Val

ValarieSimmons

Hi Ian Ian@JMP,

An extension to what I was previously working on:

Using the same data as the previous question, based on the selected words that I want from the available columns in data table "Air Traffic", I am expecting an output as shown below if the available columns in the data contains the words in the "SelectedNames" column at their respective rows:

However I am getting this error message in Log & no insertion of any correct column names in the second column:

These are my codes, can you help me to check what's wrong with them?

dt = Open( "$SAMPLE_DATA/Air Traffic.jmp" );
a = {"Number", "Flight"};
col = dt << get column names( string );
nc = N Items( col );
dt1 = New Table( "Table1" );
c1 = (dt1 << New Column( "SelectedNames", character, set values( a ) )) << get values;
dt1 << New Column( "AvailableColumns", character );
xxx={};
For( j = 1, j <= N Items( c1 ), j++,
For( i = 1, i <= nc, i++,
If( Contains( col[i], a[j] ),
Insert Into( xxx, col[i] )
);
Column( dt1, 2 )[j] = Eval( xxx );
xxx = {};
);

ian_jmp

You need to distinguish between a list and the type of items that it holds (which, in general, don't have to be homogenous). The error is due to the fact that you are trying to put list xxx (which happens to contain items that are all character), into a cell in a character column.

The best way to do this will depend on what happens next in your code. I suspect that you might want to have 'AvaliableColumns' as an expression column, rather than a character column:

dt = Open( "$SAMPLE_DATA/Air Traffic.jmp" );
a = {"Number", "Flight"};
col = dt << get column names( string );
nc = N Items( col );
dt1 = New Table( "Table1" );
c1 = (dt1 << New Column( "SelectedNames", character, set values( a ) )) << get values;
dt1 << New Column( "AvailableColumns", expression );
For( j = 1, j <= N Items( c1 ), j++,
xxx = {};
For( i = 1, i <= nc, i++,
If( Contains( col[i], a[j] ), InsertInto(xxx, col[i]) );
);
Column( dt1, 2 )[j] =  xxx;
 
);

ValarieSimmons

Thanks again Ian.

Your solution works like a charm!

Best Regards,

Val

ENTHU

Hi,

I am stuck with a similar problem.I need to check if the columns contain either of the 2 strings and then replace column value with value in another column.

Here's the code -

For(i=1,i<= NRows(dt),i++,
if(contains(:step[i],"NA")| contains(:step[i],".") ,
:step[i] = description[i];
)

);

But I get an error saying - argument is wrong type in access or evaluation of 'Contains'

What am I doing wrong here?

cwillden

This is pretty different from the original thread. I suggest creating a new topic. Does your step column have a numeric data type?

ENTHU

No.The column type is character.