Multi-dimension array definition?

fogled@mizzou

It appears that I cannot create my own "offset" index for multi-dimension arrays. This works, and I get the values from the multi-dim array on the button push:

DEFINE_CONSTANT
integer lvl_mic_preval[][] = { 
{1,3,0},
{2,4,0},
{3,5,0}
}

DEFINE_EVENT
button_event[tp,121] 
{
    push: 
    {
	send_string debug,"'DEBUG: preset_val: 1=',itoa(lvl_mic_preval[button.input.channel - 120][1]),'; 2=',itoa(lvl_mic_preval[button.input.channel - 120][2]),'; 3=',itoa(lvl_mic_preval[button.input.channel - 120][3])"
    }
}

...and the following compiles OK, but I do not get the values from the multi-dim array:

DEFINE_CONSTANT
integer lvl_mic_preval[][] = { 
121,{1,3,0},
122,{2,4,0},
123,{3,5,0}
}

DEFINE_EVENT
button_event[tp,121] 
{
    push: 
    {
	send_string debug,"'DEBUG: preset_val: 1=',itoa(lvl_mic_preval[button.input.channel][1]),'; 2=',itoa(lvl_mic_preval[button.input.channel][2]),'; 3=',itoa(lvl_mic_preval[button.input.channel][3])"
    }
}

So It appears that I cannot specify what the value of that first dimension is, I just have to live with an auto-index starting at 1?

Is there a way to get an offset index for the first dimension of a muti-dim array?

Thanks,

mpullin

I think I know what you're asking, and the answer is no. Arrays have to start at index 1.

jweather

You are correct, dimensions always start at 1. For a simpler solution to the problem you're showing, try something like

DEFINE_CONSTANT

integer btnARRAY[] = {121, 122, 123}
integer lvl_mic_preval[][] = { 
{1,3,0}, // 121
{2,4,0}, // 122
{3,5,0}  // 123
}

DEFINE_EVENT
button_event[tp,btnARRAY] 
{
    push: 
    {
	send_string debug,"'DEBUG: preset_val: 1=',itoa(lvl_mic_preval[GET_LAST(btnARRAY)][1]),'; 2=',itoa(lvl_mic_preval[GET_LAST(btnARRAY)][2]),'; 3=',itoa(lvl_mic_preval[GET_LAST(btnARRAY)][3])"
    }
}

Basically, GET_LAST and the btnARRAY give you your mapping from (121,122,123...) back to (1, 2, 3...) which are your array indices.

Untested, please excuse any think-os.

Jeremy

fogled@mizzou

jweather wrote:

Basically, GET_LAST and the btnARRAY give you your mapping from (121,122,123...) back to (1, 2, 3...) which are your array indices.

Oh... the light bulb goes on...

Thank you very much!

GSLogic

fogled@mizzou wrote:

It appears that I cannot create my own "offset" index for multi-dimension arrays.

You can create multi dimensional arrays, you can even use them in Structures:

  integer multiD[2][3][3];

//multiD[house][floor][room]
  multiD[1][1][1] = 11;
  multiD[1][2][2] = 12;
  multiD[1][3][3] = 13;
	
  multiD[2][1][1] = 21;
  multiD[2][2][2] = 22;
  multiD[2][3][3] = 23;

NMarkRoberts

Use a wrapper function

If you always refer to the array via wrapper functions, you can code the easy-to-get-wrong bit(s) just once and use them with confidence thereafter. Think object oriented.

DHawthorne

I prefer to make a CONSTANT list defining my array elements, so instead of having to reference the numbers, I can have readable indexes.

fogled@mizzou

DHawthorne wrote:

I prefer to make a CONSTANT list defining my array elements, so instead of having to reference the numbers, I can have readable indexes.

Any possibility you could expound on that just a bit? I'm not sure I understand what you mean. I'm trying to define a constant, and I can't get anything but numbers - not of my own choosing - for indexes.

alexanbo

What I think he is talking about is say the first index of the array represents rooms.

In your constants you'd do something like

Living = 1
Dining = 2
Den = 3

Then when referencing the array you can write
[Living][blah]

If you got real ambitious you might be able to use Hash Maps and such in Java on the Duet side.

DHawthorne

alexanbo wrote:

What I think he is talking about is say the first index of the array represents rooms.

In your constants you'd do something like

Living = 1
Dining = 2
Den = 3

Then when referencing the array you can write
[Living][blah]

If you got real ambitious you might be able to use Hash Maps and such in Java on the Duet side.

Exactly Sorry if I wasn't clear.

fogled@mizzou

alexanbo wrote:

Living = 1
Dining = 2
Den = 3

Thanks everyone! I think I've got a handle on this now. On to the next question...