better way to do this using math

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- 4th August 2014, 23:20
longpole001

better way to do this using math

hi guys , have mind blank on how to best do this code in math than use a lookup

Code:

if val < 6 AND Menu_Select = 211 then lookup val,[0,2,4,8,16,32],val if val =>6 and val <= 11 and Menu_Select = 2112 then lookup val-6,[0,2,4,8,16,32],val if val =>12 and Menu_Select = 2113 then lookup val-12,[0,2,4,8,16,32],val
- 5th August 2014, 01:11
longpole001

Re: better way to do this using math

retry

Code:

if val < 6 AND Menu_Select = 211 then lookup val,[1,2,4,8,16,32],val if val =>6 and val <= 11 and Menu_Select = 2112 then lookup val-6,[1,2,4,8,16,32],val if val =>12 and Menu_Select = 2113 then lookup val-12,[1,2,4,8,16,32],val
- 5th August 2014, 01:42
aratti

Re: better way to do this using math

Power 2 to the value of val ( 2^val) and you will get the same value as your lookup table.
Since 2^0 = 1 you will use an if then to turn it into zero.
Cheers

Al.
- 5th August 2014, 05:21
longpole001

Re: better way to do this using math

the manual shows " ^ " to be a bitwise exclusive OR ?
- 5th August 2014, 06:17
aratti

Re: better way to do this using math

Forgotten that PBP has not the power. Well you can use the shift left. Every shift you multiply by two so B1 = B0 << val where B0 = 1. Still need the filter to turn the one into zero, when val = 0.

Cheers

Al.
- 5th August 2014, 06:59
EarlyBird2

Re: better way to do this using math

Quote:

Originally Posted by longpole001

retry

Code:

if val < 6 AND Menu_Select = 211 then lookup val,[1,2,4,8,16,32],val if val =>6 and val <= 11 and Menu_Select = 2112 then lookup val-6,[1,2,4,8,16,32],val if val =>12 and Menu_Select = 2113 then lookup val-12,[1,2,4,8,16,32],val

Obviously I do not know how this code fits into your main program but here is an idea that could be of use.

Code:

WHILE val > 5 val = val - 6 wend val = 1 << val

I am not sure about this line "val = 1 << val " just try it is all I can suggest.
- 5th August 2014, 09:03
longpole001

Re: better way to do this using math

yep i did not see an easy math "power " option , which would be good
i am just trying to save code space a bit, lookups take more code space than math calc
- 6th August 2014, 08:01
EarlyBird2

Re: better way to do this using math

Quote:

Originally Posted by EarlyBird2

Obviously I do not know how this code fits into your main program but here is an idea that could be of use.

Code:

WHILE val > 5 val = val - 6 wend val = 1 << val

I am not sure about this line "val = 1 << val " just try it is all I can suggest.

Sheldon,

I have tested this and it works a treat. It must save a lot of code space compared to your original three lines?