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+---- Thread: 2D Array Errors (/showthread.php?tid=2610)
2D Array Errors - raymondlesley - 02-13-2025
I've been enjoying using ZX BASIC so far. It's great to have something that's easy to use (and in-keeping with the original Sinclair BASIC). I have come up against an issue which I can't find a solution for:
The compiler supports multi-dimensional arrays, but it throws an error if I attempt to get a "slice" of the data.
My code:
Code:
DIM data_array(0 TO 2, 0 TO 3) AS UByte = { _
{0, 1, 2, 3}, {4, 5, 6, 7}, {8, 9, 10, 11} _
}
DIM element12 AS UByte = data_array(1, 2)
DIM element0(0 TO 3) AS UByte
element0 = data_array(0) ' throws an errorI get no errors relating to element12
I would expect that element0 should result in {0, 1, 2, 3}. It's the right "shape". Instead I get an error:
Quote:
array_test.bas:9: error: Syntax Error. Unexpected token '(' <LP>
I've tried variants e.g. data_array(0, : ) or data_array(0,0 TO 3). Nothing seems to work.
I'm using ZX BASIC 1.17.2
RE: 2D Array Errors - boriel - 02-16-2025
Was that feature actually allowed in Sinclair Basic??
The error is expected. You cannot do that, only copying entire arrays (of the same dimension) onto another.
However it's a nice feature. Will thing of implementing it...
In the meantime, you can create a function to do this (arrays can be passed as parameters) or do it directly at low level:
Code:
#include <memcopy.bas>
DIM data_array(0 TO 2, 0 TO 3) AS UByte = { _
{0, 1, 2, 3}, {4, 5, 6, 7}, {8, 9, 10, 11} _
}
DIM element12 AS UByte = data_array(1, 2)
DIM element0(0 TO 3) AS UByte
REM element0 = data_array(0) ' throws an error
MemCopy(@data_array(0, 0), @element0(0), 4)