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Transposing very large data table

sgourshe

Hi,

I have a very large data file, (20+ million rows, 10 columns) that I need to transpose. Unfortunately, jmp is not capable of executing such large file quickly or efficiently. I found that jmp is able to manipulate data in text format much easily. I have tried all options of save/open as .txt but no vail..

Can someone help transposing this table either in txt format or data table (list, array etc.)?

I need the following example table to look like the output below, without using the "transpose" function as it won't work for million+ rows: ''

Data table:

col1 col2

a l

s w

4 j

t sdf

Desired output (either as a txt file or a table with only 1 col and 2 rows):

col1, a,s,4,t,t,o,p

col2,l,w,j,sdf

Please and Thank you

Accepted answers

Craige_Hales

I think you have non-numeric columns so you can't use a matrix, You might make your string value as a concatenation of items in a list, and you can get a list from a character column with the <<getvalues message.

alist = dt:a<<getvalues; show(nitems(alist));
astring = concatItems(alist,","); show(length(astring),left(astring,100));

N Items(alist) = 21000000;
Length(astring) = 207635028;
Left(astring, 100) = "1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,";

JMP has a limit of 2 billion characters for a string. You might be getting close.

All comments

Craige_Hales

alist = dt:a<<getvalues; show(nitems(alist));
astring = concatItems(alist,","); show(length(astring),left(astring,100));

N Items(alist) = 21000000;
Length(astring) = 207635028;
Left(astring, 100) = "1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,";

JMP has a limit of 2 billion characters for a string. You might be getting close.

sgourshe

Super thank you for quick reply! Easier than I thought.

Anyway, I can assign a particular cell in a table to to be this astring?
such that I have a table that has (taking the original example I used) 1 column and 2 rows looking like the following:
Column1
Row1: a,s,4,t,t,o,p
Row2: l,w,j,sdf

Craige_Hales

Yes, http://www.jmp.com/support/help/Accessing_Data_Values.shtml#790448 has an example like this:

dt:age[10] = 20; // set the value of age in row 10 to 20

You might want to make a prototype 2-line table with the column names (and data types!) you need and use the "get script" from the red triangle menu. You can then paste that script into your own code. In the example above, [10] is for row 10; you might use two assignments for [1] and [2]. The 20 is for a numeric column; your column is character if the astring variable is going to be stored in it.

sgourshe

Very cool thanks. Although useful, I was particularly wanting to get only the string value into the cell. Unfortunately the string includes extra comma seperations for empty cells.

ie. given there are 2 columns, the 1st col has 10 rows and the 2nd col only has data for 5 rows. When I implement the string concate that you mentioned above I get the string value for second col as astring = "a,s,r,w,d,,,,,,"

I am particulary interested to get only "a,s,r,w,d", excluding the extra comma seperations. Any directions you can point me to? I'd great appreciate it.

Thank you,

Shiv

ctsc

@Paul_Nelson, building on GM1's latest post:

running this script:

Clear Log();
Names Default To Here( 1 );
Python Init(Path("/Library/Frameworks/Python.framework/Versions/3.7/lib/libpython3.7.dylib"), 
    Use Python Version("3.7")	
);

Python Submit("\[

print("Done importing modules")

]\");

Python Term();

gives the following output in the log:

Screen Shot 2019-01-22 at 5.30.40 PM.png

Running this JSL script:

Clear Log();
Names Default To Here( 1 );
Python Init(Path("/Library/Frameworks/Python.framework/Versions/3.7/lib/libpython3.7.dylib"), 
    Use Python Version("3.7")	
);

Python Submit("\[

import numpy as np
print("Done importing modules")

]\");

Python Term();

gives the following output to the log:

Screen Shot 2019-01-23 at 9.52.26 AM.png

GIven the succesfull exit code, I think this error is very unclear. JMP/JSL seems to not know where to find modules to import?? Any help is greatly appreciated