Max value of each row across multiple columns and the corresponding name of the source column

[#1]

Hi, is there an easy way to find the max value of each row and the column name (or parameter) corresponding to the max value? Below is a simple example to illustrate the request:

T1	T2	T3	T4	T5	T6	T7	T8	T9	T10	Max_Value	Col_Name (Parameter)
87.2	83.6	81.4	83	83	83	83	82.3	83.3	84.6	87.2	T1
85.9	84	82	84	83.3	83.3	84	83	86.5	87.2	87.2	T10
84.9	82.7	86	83	82.3	82.3	83	82	83.6	85.2	86	T3
85.6	84.6	82.7	84.6	84.3	84.3	84.3	83.6	84.9	86.2	86.2	T10
85.2	83.6	82	83.3	83	83	83.3	82.3	84.3	85.6	85.6	T10
86.8	84.3	82.7	84.3	83.6	83.6	84.3	83.3	85.9	86.2	86.8	T1
86.2	84	82.3	84	87	83.3	83.6	83	84.9	85.9	87	T5
88.1	84.6	82.3	84.3	83.6	84	84.3	83.3	85.9	86.2	88.1	T1
85.6	83.3	81.7	83.3	83	83	83.6	82.7	84	85.9	85.9	T10
37.4	36.1	36.4	36.4	36.1	36.1	36.4	35.4	36.7	37.4	37.4	T1
36.7	34.5	34.8	34.5	33.8	34.1	34.5	33.5	36.1	36.1	36.7	T1
34.8	32.9	33.2	32.9	32.2	32.5	36	31.9	33.8	35.1	36	T7
38	36.4	36.4	36.4	36.4	36.1	36.7	39	38	38.3	39	T8
38	35.1	35.1	40	34.1	34.5	34.8	33.8	36.4	37	40	T4

Thanks!

[#2]

Looking for the exact same solution.
For each row find max value and return column name so i can run statistics on the resultant data.
Eg to find how many times a column name shows up as maximum, the number of columns that contribute to max value, the STD DEV etc.

[#3]

// this example uses JMP 13 data table indexing

dt = New Table( "Untitled",
    New Column( "a", Numeric, Set Values( [1, 33, 1] ) ),
    New Column( "b", Numeric, Set Values( [2, 2, 2] ) ),
    New Column( "c", Numeric, Set Values( [333, 1, 0] ) ),
    New Column( "maxval", numeric ),
    New Column( "maxcol", Numeric )
);

colnames = dt << getcolumnnames;

For Each Row(
    r = Row();
    // 1::3 means columns 1 through 3.  {a,b,c} would also work.
    location = Loc Max( dt[ r, 1 :: 3] ); // location of maximum value in array
    maxval = dt[r, location];
    maxcol = colnames[location] << getname;
);

Data table with maximum value from row and name of maximum column for row

Earlier post on data table subscripting

[#4]

I have run into one issue here, if the columns I need to choose are between the data set it doesnt seem to work.

For Each Row(
    r = Row();
    // 1::3 means columns 1 through 3.  {a,b,c} would also work.
    location = Loc Max( dt[ r, 57 :: 113] ); // location of maximum value in array
    maxval = dt[r, location];
    maxcol = colnames[location] << getname;
);

I need to choose columns 57 through 113, but for some reason when I do this it through the script off and i get incorrect values. 

[#5]

Resolved i was missing the offset of columns that had to be added to the location variable.

[#6]

Good point. The example could be generalized like this (intentionally ugly column arrangment...) Pick one of the either/or that works best for you. The 2nd one has the advantage of isolating you from accidental rearrangements of the columns. The first one might be good for 100s of columns.

dt = New Table( "Untitled",
    New Column( "maxval", numeric ),
    New Column( "a", Numeric, Set Values( [1, 33, 1] ) ),
    New Column( "maxcol", Numeric ),
    New Column( "b", Numeric, Set Values( [2, 2, 2] ) ),
    New Column( "c", Numeric, Set Values( [333, 1, 0] ) ),
);


// either
vars = [2 4 5];
colnames = (dt << getcolumnnames)[vars];
// or
colnames={a,b,c}; // this might be best choice


For Each Row(
    row = Row();
    location = Loc Max( dt[ row, colnames] ); // location of maximum value in array
    col = colnames[location]<<getname;
    maxval = dt[row, col];
    maxcol = col;
);

[#7]

It still doesn't work properly for me. Attached please find both the script and the data files. Could you please let me know what I did wrong here? 

Thanks!

[#8]

The script and data table worked great for me.  Now, I did change the

     dt=Open("........");

to

     dt=current data table();

Since the table was already open.

So, I would suggest that you try that, or that you place an additional statement after your dt=Open statement:

     wait(0);

There is a chance that your data table has not finished before the For Each Row starts.  The Wait(0); will force the open to complete before running the For Each Row

[#9]

Thanks much Jim for the reply! However, it still doesn't work for me with dt=current data table(). Not sure what is going on. BTW, could you send me the output file you generated?

Thanks!

[#10]

Here is the data table after I ran the script