how to pass data to arrays based on the value of first 4 digits of 7 digit strings

[lolasue]

I want to sort incoming data, into various arrays based only on the first 4 digits of each string.

For example a hex string could be 41322033333533 which is A1 3353.

A1 stands for a particular sensor., and I want to sent all the A1 data to an array.I have data coming from 8 sensors, and want to send the data to separate sensor arrays. My sensor names are A1,A2,A3, T1,T2,T3,W1

I was going to use a case structure, for loop and an '=' comparison for the data. However I only want to compare the first 4 digits of the string and I cannot find an operator for this. Any advice on how to do this would be appreciated.

[Daikataro]

Try using the "string subset" function to get the first 4 digits of the data and compare that

[lolasue]

Yes but if I do that dont  I lose the rest of the string, which is the sensor value I wish to store in an array?

[Daikataro]

Nope, what this function does is to create a separate, independing string containing X digits past Y offset. The original is unchanged, any "subset" LabView functions don't alter the original in any way unless you programatically say so.

[lolasue]

Ok but I am unsure of how to run that sequence then. If data feeds into 'string subset', my output is a subset string. I compare the subset strings. If the subset string meets the A1 condition it goes to the A1 array. But at this point how do I send the original string to the A1 array and not the subset string?

[Daikataro · Accepted solution]

With a wire, like this

[lolasue]

Thanks Daik, I understand your VI. I'm new to Labview and couldnt get my head around how to solve the problem.

[lolasue]

One other question: My data is coming in in Hex format ie 41 32 20 33 33 35 33 but comes in looking like this  41322033333533. Does labview consider 4132 as the first 4 or first 2 elements in the string?

[crossrulz · Accepted solution]

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@lolasue wrote:

but comes in looking like this  41322033333533. Does labview consider 4132 as the first 4 or first 2 elements in the string?

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That looks like what I call "ASCII Hex".  You have 2 ASCII characters to represent a single byte of data.  It is twice the storage, but is easily human readable.  But if the string is actually "41322033333533", the first four characters is "4132".