[Tutor] R: re question on array

[Alan Gauld]

On 30/10/14 08:32, jarod_v6 at libero.it wrote:

> Sorry for my bad presentation of my problem!!

Thats OK, and this explanation is much better, thanks.
> A file with a long liste of gene ad the occurence for sample:
>
> gene	Samples
> FUS	SampleA
> TP53	SampleA
> ATF4	SampleB
> ATF3	SampleC
> ATF4	SampleD
> FUS	SampleE
>
> WHat I want to obtain is amtrix where I have the occurence for sample.
> 	SampleA	SampleB	SampleC	SampleD	SampleE
> FUS	1	0	0	0	1
> TP53	1	0	0	0	0
> ATF4	0	1		1	0
> ATF3	0	0	1	0	0
>
> In that way I count count the occurence in fast way!

You probably want a dictionary keyed on the gene and
with a list of samples as the value.

Using the data above the final result would be

data = {
'FUS'  : [1,0,0,0,1]
'TP53' : [1,0,0,0,0]
'ATF4' : [0,1,0,1,0]
'ATF3' : [0,0,1,0,0]

You would need to initialise each entry to all zeros when you create it. 
Then overwrite the sample positions as you discover them.

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-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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