For loop generates no output nor errors

Question

I have the below For loop to generate Histograms for 16 values in my dataset but I have no historgam showing. What may I be doing wrong?

 For[i = 1, i < 17, i++,
  mycnr = StringJoin["CNR", ToString[i]];
  cnr[i] = newDataSet[All, mycnr];
  Histogram[cnr[i]]]

when I comment out lines 3 and 4 inside for loop to see the outcome of the StringJoin function, I do not see the mycnr simply showing the CNR1 to CNR16 I expect from such StringJoin

I apologize, I am new at Mathematica, so "be gentle" :-)

use Table instead of For. (and read this.. http://mathematica.stackexchange.com/q/134609/2079) — george2079, Feb 21 '17 at 22:34
You should also read up on Dataset as you are missing out on some powerful functionality. Consider ds = AssociationThread[{"A1", "A2", "A3"}, #] & /@ RandomInteger[{3, 15}, {20, 3}] // Dataset; dsCharts = ds[Transpose /* Map[Histogram], {"A1", "A2"}]; dsCharts Then dsCharts["A1"] — Edmund, Feb 21 '17 at 22:47
Thank you, yes, I have much to learn. Print worked very well and fixed teh instability of the statement. Sometimes it worked fine, then as I added other code it broke again, but with Print, it stabilize it. — wlnwtz28, Feb 21 '17 at 22:51

score -1 · Answer 1 · edited Feb 21 '17 at 22:38

-1

I simplified it and finally got it to work:

For[i = 1, i < 17, i++, 
  Histogram[newDataSet[All, StringJoin["CNR", ToString[i]]]]
];

edited Feb 21 '17 at 22:38

MarcoB

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answered Feb 21 '17 at 22:35

wlnwtz28

1
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For loop generates no output nor errors

1 Answers1