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Forum Index : Microcontroller and PC projects : READ Matrix Command

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toml_12953
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Joined: 13/02/2015
Location: United States
Posts: 480

Posted: 11:34am 31 Jul 2021

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Since some features are still in beta, would it be possible to bring CMM2 in line with other BASICs that have a MAT READ and vary the column faster than the row? I don't think that many programs have been written yet that this change would break while there have been thousands of programs that need rewriting as it is now.

In other BASICs:

DIM A(2,2)
MAT READ A
DATA 1,2,3,4
MAT PRINT A

1 2
3 4

In CMM2 BASIC

DIM A(2,2)
READ A()
DATA 1,2,3,4
MATH M_PRINT A()

1 3
2 4

Edited 2021-07-31 21:37 by toml_12953

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10610

Posted: 11:57am 31 Jul 2021

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Quote In CMM2 BASIC

toml_12953
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Joined: 13/02/2015
Location: United States
Posts: 480

Posted: 02:28pm 31 Jul 2021

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matherp said

Quote In CMM2 BASIC

Something is different:

option base 1
dim a(3,3)
read a() ' MAT READ A in Standard BASIC
data 1,2,3,4,5,6,7,8,9
for r=1 to 3
for c=1 to 3
print a(r,c),
next c
print
next r

Output in MMC2
1 4 7
2 5 8
3 6 9

Output in Standard
1 2 3
4 5 6
7 8 9

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10610

Posted: 02:44pm 31 Jul 2021

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As I've explained in all matrix operations in MMBasic the fastest moving dimension is the first. Everything is self consistent. For your program just reverse the indices in your for loops. This isn't going to change.

From the manual

Quote Note:
2 dimensional maths matrices are always specified DIM matrix(n_columns,
n_rows) and of course the dimensions respect OPTION BASE.

Edited 2021-08-01 01:38 by matherp

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