Re: [ferret_users] cumulative distribution curve

[Sudheer Joseph <sjo.india@xxxxxxxxx>]

Hi Gopika,

                    Basic issue here is that you have just 36( in file and reading 33 as per your code)  points in your data file and you are defining a grid with length of 201 and trying to read data in to it  your data is not 2d but 1d only. Ferret will not be able to understand which years among the 201 years you have occurrences unless you tell it. In other words, you should have date stamp against each occurrences and then you will be able to go further.

Sincerely,

Sudheer

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On Mon, Dec 2, 2019 at 11:53 AM gopika suresh <gopikasurvay@xxxxxxxxx> wrote:

Dear Ryan

thank you for the reply, but I think I will explain the problem little more specifically

here i am having 36 points in my x-axis (attached as hval)

and I have tried to find out the frequency per year (1900-2100 which means 201yrs) by running the below command. But I am getting values for the years which don't have any occurrence just the same as the previous year frequency (attachment frequency.txt).  I want those years with zero frequency as the number zero only not the value from previous year.  

code:

DEFINE AXIS/X occurences = hval[x=1:33]

LET pdf = I[gx=occurences]

DEFINE AXIS/X=1900:2100:1 my_intervals

let frequency=pdf[gx=my_intervals@sum]

thanks

gopika

On Mon, Dec 2, 2019 at 11:35 AM Ryo Furue <furue@xxxxxxxxxx> wrote:

Dear Gopika,

On Sun, Dec 1, 2019 at 11:32 AM gopika suresh <gopikasurvay@xxxxxxxxx> wrote:

If some value is there in any year then it will be increasing otherwise straight line.

Basically, the @RSUM does that, if I understand your requirements correctly:

yes? let events = {1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1}

yes? plot/symbols/lines events, events[i=@RSUM]

The problem is that Ferret defines RSUM on the "wrong" gridpoints.  You want to shift it to the left by half gridspacing.  To do so would require a bit of complicated manipulation . . .  and you also want the initial value of the cumulative sum to be zero. . . .  (Personally, I would write the values to a text file, read it by a program and compute the cumulative sum, and plot the result with gnuplot.)

Cheers,

Ryo

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Gopz