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Sep 15, 2015 9:25 AM
(6854 views)

Hello, Gurus,

I have a very simple question on how to extract certain bits from a string hex column(named Flags) to numbers. My column values will be like "0x1BA1". I would like to extract the bits 8 and 9 values and convert them to a value of 3 into my new column. Since I don't know the binary operation in jmp, I tried to extract B into 11 first by doing the following

Char To Hex(Munger(:Flags, 4, 1)).

It gives me a character column of 42. I tried to put a "integer" in to the formula

Char To Hex((Munger(:Flags, 4, 1)), "integer")

But it wouldn't recognize it. I'm using jmp11.2.1.

After extracting B, I'll use module(module(value,8),4) to get the lower 2 bits.

If there's an easy way to extract binary bits, that will be even better.

Thank you,

Jane

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As Craige pointed out (thanks, I was not aware), JMP 11 requires an even number of hex characters.

Try this formula for single character substrings:

Hex To Number**(**"0" || Substr**(**Flags, **4**, **1****))**;

6 REPLIES 6

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Re: how to extract certain bits from a string hex column to number ?

There is a function Hex to Number() that converts hexadecimal numbers (as strings) to decimal numbers.

Example:

hex = "0x1BA1";

// Hex to decimal

value = Hex To Number**(**Substr**(**hex, **4**, **1****))**;

Show**(**value**)**;

// decimal to binary

bin = "";

While**(**value,

bin = Char**(**Modulo**(**Num**(**value**)**, **2****))** || bin;

value = Floor**(**value / **2****)**;

**)**;

Show**(**bin**)**;

// Reverse last step for confirmation (or just for fun)

value2 = Sum**(****2** ^ **(**Loc**(**Reverse**(**Words**(**bin, ""**))**, "1"**)** - **1****))**;

Show**(**value2**)**;

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Re: how to extract certain bits from a string hex column to number ?

before JMP 12 you'll need an even number of hex characters:

Hex To Number( "0B" )

11

Craige

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Re: how to extract certain bits from a string hex column to number ?

Hi, Craig,

Thank you. The magic "0" in front of "B" is the key.

Jane

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Re: how to extract certain bits from a string hex column to number ?

Hello, MS,

I have trouble with these "Hex to .." command. They don't work on my case. Here's the screen copy. I don't know what could be wrong.

Thank you,

Jane

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As Craige pointed out (thanks, I was not aware), JMP 11 requires an even number of hex characters.

Try this formula for single character substrings:

Hex To Number**(**"0" || Substr**(**Flags, **4**, **1****))**;

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Re: how to extract certain bits from a string hex column to number ?

Thank you, MS.

I tried the concat "0" and it works.

Jane