[R] Fwd: the same function returning different values when called differently..

Wed Mar 14 17:27:38 CET 2018

Hi Akshay,

(Please include r-help when replying)

You have learned that PFC.NS and snl[[159]] are not identical. Now you have
to figure out why they differ. This could also point to a bug or a logic
error in your program.
Figuring out how two objects differ can be a bit tricky, but with
experience it becomes easier. (Some others may even have some suggestions
for good ways to do it.)
Basically you would work your way down. At the top level is the class of
each, which you already tested and they are identical.

Now try:

> str(PFC.NS)

and compare it to

> str(snl[[159]]

Look closely at the two outputs to try to detect differences. If they are
the same then you will have to examine the sub-objects described by str().
You didn't mention what type of objects they are. Suppose they are both
"numeric" vectors. Then you can check whether their lengths are equal.
And you can compare their values, etc. etc. No short cut that I can think
of without more information.

It definitely takes work to find discrepancies. Think of it as a challenge
and perhaps write functions that you can use to automate this kind of
comparison in the future.
(Again, other people on this list might be able to point to tools that help
with this for objects of specific type.)

Good luck,
Eric

dear Eric,

                   Bulls eye...! identical(PFC.NS, snl[[159]])) is
resulting false..but class(PFC.NS) and class(snl[[159]]) are same...

I want snl[[159]] to be equal to PFC.NS...how do I effect it? create a list
with some other element list... for example snl[[200]] == PFC.NS?

very many thanks for your time and effort...

yours sincerely,

AKSHAY M KULKARNI

------------------------------
*From:* Eric Berger <ericjberger at gmail.com>
*Sent:* Wednesday, March 14, 2018 5:22 PM
*To:* akshay kulkarni
*Cc:* R help Mailing list
*Subject:* Re: [R] the same function returning different values when called
differently..

Hi Akshay,
Presumably PFC.NS and snl[[159]] are not exactly the same.
You can start by trying to determine if (and then how) they differ.
e.g.
> identical(PFC.NS, snl[[159]])
presumably this will result in FALSE

then compare
> class(PFC.NS)
> class(snl[[159]])

etc

HTH,
Eric

On Wed, Mar 14, 2018 at 1:42 PM, akshay kulkarni <akshay_e4 at hotmail.com>
wrote:

dear members,

 I have a function ygrpc which acts on the daily price increments of a
stock. It returns the following values:

 ygrpc(PFC.NS,"h")
 [1]  2.149997  1.875000  0.750000  0.349991  2.100006  0.199997  4.000000
2.574996  0.500000  0.349999  1.500000  0.700001
[13]  0.500000  1.300003  0.449997  2.800003  2.724998 66.150002  0.550003
0.050003  1.224991  4.899994  1.375000  1.574997
[25]  1.649994  0.449997  0.975006  2.475006  0.125000  2.625000  3.649994
0.399994  1.300003  2.074997  1.025001  0.125000
[37]  3.849999  0.025002  0.824997  1.750000  1.699997  1.750000  1.699997
0.275002  2.300003  0.349998  0.750000  0.224998
[49]  0.125000  1.475006  1.599998  0.125000  0.500000  0.700005  1.099998
0.225006  1.274997  1.300003  3.000000  0.300003
[61]  0.724999  3.699997  2.424995  8.425003  1.099991  2.025009  0.850006
4.000000  1.724991  0.949997  1.825012  2.799988
[73]  0.425003  1.799995  5.700005  2.125000  0.125000  4.000000  2.350006
1.524994  1.299995  0.300003  0.949997  0.449997
[85]  1.899994  1.700005  1.150009  0.849998  2.449997  5.300003  0.19999

I also have a list of stocks called "snl" with snl[[159]] pointing to
PFC.NS (above):
tail(snl[[159]])
           PFC.NS.Open PFC.NS.High PFC.NS.Low PFC.NS.Close PFC.NS.Volume
PFC.NS.Adjusted
2018-03-07       98.40       98.45       95.1        95.30       7854861
       95.30
2018-03-08       94.90       94.95       89.3        91.90      12408061
       91.90
2018-03-09       92.00       94.50       91.9        93.10       7680222
       93.10
2018-03-12       93.40       93.85       86.1        88.25      12617833
       88.25
2018-03-13       89.20       91.85       86.2        89.85      12792630
       89.85
2018-03-14       88.65       89.30       86.1        86.70      16406495
       86.70

But ygrpc(snl[[159]],"h") returns :
ygrpc(snl[[159]],"h")
[1] 1

Can you please shed some light on what is happening?

Very many thanks for your time and effort....

Yours sincerely
AKSHAY M KULKARNI

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