Memory overflown for the number to be saved

Hi

I have string like this.

A={'IMSI=208016702935545 CI=20796 LAC=29188'};

I have done this

imsi=regexp(A,'\w*IMSI=\w*','match');

After doing that I get

imsi{1,1}= 'IMSI=208016702935545';

Again I do this to extract the numbe out of it

cellinfo=sscanf(char(imsi{1,1}),'%*5c%d');

But the length of IMSI is too long and is overflown. can anyone suggest something so that I can have cellinfo=208016702935545 ;

Thanks in advance

Avinash

[Oleg Komarov]

Where do you get the error?

Also, how do you create A?

[Avinash bachu]

Hi Oleg The A is input data from the servers. cant change it.

When I do the sscanf to extract the IMSI from the A; I get cellinfo as

2147483647,00000 and it is same for different IMSI number.

instead of 208016702935545

[Oleg Komarov]

Do not double post.

Then what is CI? How do you get it?

[Avinash bachu]

Sorry, my mistake.

I corrected the question now. Actually, there is no CI. CI was the name given in my code.

Answer 1

[Jan]

A = {'IMSI=208016702935545 CI=20796 LAC=29188'};
num = sscanf(A{1}, 'IMSI=%g', 1);

This should actually work, because the 15 digits of the number should be covered by the double precision. Alternatively import it as UINT64:

num = sscanf(A{1}, 'IMSI=%lu', 1);

Obviously the "%d" format saturates at the INT32 limits.

[Avinash bachu]

Thanks Jan.

Importing to uint64 didnt work. it was saturated at uint32 using %lu.

Thanks anyway

Answer 2

[Oleg Komarov]

Using the look-behind operator in regular expressions without capturing the token:

cs = regexp(A,'(?<=IMSI=)\d+','match');
str2double(cs{:})

[Avinash bachu]

Hi Oleg,

Using the look-behind operator I am able to extract cs without capturing the token.

But the memory problem hasnt been solved yet. the IMSI number is too big to be converted into double, it just gives NAN as output. I wonder how i can convert it into uint64. Check it once

Thanks again

[Jan]

@Avinash, have you seen my answer? %d overflows atthe INT32 limits, but %g imports to a double directly.

[Oleg Komarov]

@Avinash: I did not encounter the problem with your example. Do you have longer numbers?

[Avinash bachu]

Thanks Oleg. I tried cs = regexp(A,'(?<=IMSI=)\g+','match'); which didnt work. Do you have any other way around. i am very bad at matlab syntax.

[Oleg Komarov]

The '\d+' part in the regexp() does not relate to the sscanf() syntax.

cs = regexp(A,'(?<=IMSI=)\d+','match')

The line identifies characters belonging to the set '1234567890'.