Problem with SORTLIB

Discussions about the BBC BASIC language, with particular reference to BB4W and BBCSDL
zeynel1
Posts: 21
Joined: Sun 15 May 2022, 11:35

Problem with SORTLIB

The following code gives "number too big" error.
What am I doing wrong?
I'm trying to sort the array Dem with 29 items in it. Why would that be a big number?

Code: Select all

``````      REM compute uncertainty in Cavendish density values
REM cavendish-error.bbc
INSTALL @lib\$+"fnusing"
INSTALL @lib\$+"SORTLIB"

*SPOOLON output.txt
DIM Den(28)
Den()=5.50,\
\5.61,\
\4.88,\
\5.07,\
\5.26,\
\5.55,\
\5.36,\
\5.29,\
\5.58,\
\5.65,\
\5.57,\
\5.53,\
\5.62,\
\5.29,\
\5.44,\
\5.34,\
\5.79,\
\5.10,\
\5.27,\
\5.39,\
\5.42,\
\5.47,\
\5.63,\
\5.34,\
\5.46,\
\5.30,\
\5.75,\
\5.68,\
\5.85

sort%=FN_sortinit(0,0)

C%=DIM(Den(),DIM(Den()))+1
CALL sort%, Den(0)

PRINT "Den(28)=";Den(28)

Mean=SUM(Den())/29
PRINT "Dim()/29=";FNusing("##.##", Mean)

``````

zeynel1
Posts: 21
Joined: Sun 15 May 2022, 11:35

Re: Problem with SORTLIB

I just noticed that this is supposed to be integers, I'm trying to sort floating point numbers. Is that the reason? How do I sort floating point numbers?

Hated Moron
Posts: 131
Joined: Thu 07 Apr 2022, 10:10

Re: Problem with SORTLIB

zeynel1 wrote:
Wed 08 Jun 2022, 14:15
The following code gives "number too big" error.
What am I doing wrong?
Most likely it's because you have used sort% rather than sort%% (there should be two percent signs).

This is what it says in the Help manual here:

"Before any sorting operations can be carried out the library must be initialised as follows:"

Code: Select all

``````sort%% = FN_sortinit(dir%,smode%)
``````
I'm wondering if perhaps you were looking at the Help manual for BBC BASIC for Windows (in which case sort% will work) rather than the Help manual for BBC BASIC for SDL 2.0 which needs sort%%.
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zeynel1
Posts: 21
Joined: Sun 15 May 2022, 11:35

Re: Problem with SORTLIB

Great thanks! Now it works.

Yes I was looking at the Windows manual.

So this was not an integer issue then. When I saw "%" in sort%, I thought that meant integer.

Hated Moron
Posts: 131
Joined: Thu 07 Apr 2022, 10:10

Re: Problem with SORTLIB

zeynel1 wrote:
Wed 08 Jun 2022, 15:40
When I saw "%" in sort%, I thought that meant integer.
That's right, sort% is a 32-bit integer, sort%% is a 64-bit integer. BBC BASIC for Windows is a 32-bit program, BBC BASIC for SDL 2.0 is (or can be - for example on a Mac) a 64-bit program.

The sortlib library can sort any of the BBC BASIC data types (8-bit, 32-bit & 64-bit integers, 64-bit & 80-bit floats, and strings). Indeed you can mix them and have (for example) an integer array as the primary sort key, a float array as a secondary sort key and a string array as a tertiary sort key. It's very flexible.
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zeynel1
Posts: 21
Joined: Sun 15 May 2022, 11:35

Re: Problem with SORTLIB

Thanks. One more question: I noticed it sorts the original array. Is there a way to keep the original array and create a new sorted array?

Hated Moron
Posts: 131
Joined: Thu 07 Apr 2022, 10:10

Re: Problem with SORTLIB

zeynel1 wrote:
Wed 08 Jun 2022, 16:46
I noticed it sorts the original array. Is there a way to keep the original array and create a new sorted array?
Copy the array and sort the copy:

Code: Select all

``````      DIM sorted(DIM(Den(),1))
sorted() = Den()
CALL sort%%, sorted(0)
``````
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