compute speed

[Suhad Faisal]

Hello 

I need to compute agent speed without using the (distance/ time) manually , is their any alternative operator or statement to do that ? 

thanks in advance 

cheers 

Suhad

[Arnaud Grignard]

https://code.google.com/p/gama-platform/wiki/G__SkillsAndControl#Skills

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[Suhad Faisal]

thanks for reply Arnaud 

well  in my data I have coordinates and time, so when I try to compute speed from distance between coordinates and their time , I have a division by zero problem, so I thought their could be any trick to avoid this.

cheers 

Suhad

[Arnaud Grignard]

Well if your data as the moving skill you can use what I sent. Otherwise of course Gama is not magic and it will not compute a speed for you (especially if you have some time value equal to 0)

I think you already sent a question about having a division by zero recently, no? Did you clean your data??

Arnaud

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[Suhad Faisal]

yes I did ... but my data hasn't eny error; cause there is already time value equal to zero  in it , so at specific period the value will be zero mandatory.

cheers 

Suhad

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[Arnaud Grignard]

I don't what to say. If you divide something by zero of course you will have a problem.

So what you can do is to check before the value of your data with something like;

if(mydata!=0)
{

I do something;

}

[Suhad Faisal]

thank you , I'm searching now for mathematical trick or any equation can keep the value indication ... like average, difference between successive events ...etc.

cheers

suhad

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[Srirama Bhamidipati]

Let us say you have three segments of your trip. A B C, if value for B is missing, you can take an average from A and C. If A or C is missing, I would just use the value of B. You don't necessarily have to do this in GAMA, you can clean it outside Gama and then bring it in. 

Second approach will be to plot your data, and check a spatial correlation, that is if your (missing) trip segment is passing through city center, and you have other data that fall in this same area, you can use those (other) values as representative value for your missing data.

Or you can make an assumption that, if there is no data, you assume average speed to be some 25km/hr. This is same as Arnaud suggested. 

if(mySpeeddata=0)
{

use 25km/hr

}

regards,

srirama

[Suhad Faisal]

many thanks  

dear Srirama for your argument, indeed scientific discussion is the most

important thing in developing and progress, but I don't have missing data, 

instead I have a midnight period its time equal to zero i.e. my day hours data in 

range (0-23), so Zero  value causes "division by zero" in my computations.

best regards

yours

Suahd

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[Arnaud Grignard]

Why don't you do an offset by one so your data will be from 1 to 24? to avoid you division by zero? just add someting like "time + 1" or something like that. (Sorry but I don't call it a scientific discussion..)

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[Suhad Faisal]

thanks dear Arnaud

I'm trying a condition to assume the value as 11.59 when the value is 0 that makes it near to midnight without being zero.

well, any arguments or opinions I consider them "scientific" , as well as I respect these details and cosider it the "salt of food ".

cheers

suhad