Working with 2D array in a structure

Using Arduino Programming Questions
#1

Hi everyone, fine? :slight_smile:

This is my structure header file :

#ifndef PRESSION_H_INCLUDED
#define PRESSION_H_INCLUDED

typedef struct PRESSION PRESSION;
struct PRESSION
{
    signed int si_Consignes[11];
    signed int si_ValeursAdcParfaites[11];

    unsigned int ui_TempIndex; // en °C/10
    signed int si_TempPrises[3];

    signed int si_ValeursPrises[11][3]; // 0 : TA @ 5°C
                                        // 1 : TA @ 35°C
                                        // 2 : TA @ 75°C

    double ud_GainOffset[11][3];        // 0 : Gain @ 5°C  // Pression->si_GainOffset[5][i] correspond a l'offset
                                        // 1 : Gain @ 35°C
                                        // 2 : Gain @ 75°C

    double ud_DeriveGainOffset[11][3];  // 0 : Derive @ 5°C  // Pression->si_DeriveGainOffset[5][i] correspond a la dérive de l'offset en température
                                        // 1 : Derive @ 35°C
                                        // 2 : Derive @ 75°C

    signed int si_TempAmbiante;

    signed int ValeurEnCours;
    signed int OffsetEnCours;
    double GainEnCours;
    signed int ValeurCorrigee;

    unsigned int ui_AdcRes;

    unsigned int AdressesMembres[7];
};

void InitPression(PRESSION *pression, signed int si_ConsigneLow);
void GetValues(PRESSION *pression);
void CalculOffset(PRESSION *pression);
void CalculGain(PRESSION *pression);
void Process(PRESSION *pression);
#endif // PRESSION_H_INCLUDED

And this is the method which doesn’t work :

void CalculGain(PRESSION *pression)
{
    for(int j = 0; j < 3; j++)
    {
        for(int i = 0; i < 5; i++)
        {
            pression->sd_GainOffset[i][j] = (double)(pression->si_ValeursAdcParfaites[i][j]) / (double)(pression->si_ValeursPrises[i][j] + pression->sd_GainOffset[5][j]);
        }
        for(int i = 6; i < 11; i++)
        {
           pression->sd_GainOffset[i][j] = (double)(pression->si_ValeursAdcParfaites[i][j]) / (double)(pression->si_ValeursPrises[i][j] + pression->sd_GainOffset[5][j]);
        }
    }
}

error : suscripted value is neither array nor pointer nor vector.

I read somewhere I had to use double pointer, but don’t know how and if it works…

Thank’s guys! :slight_smile:

#2

I don't have my glasses but your array pression->[color=red][b]s[/b][/color]d_GainOffset does not seem to exist...

don't you mean pression->[color=green][b]u[/b][/color]d_GainOffset ?

#3

You have declared a one dimensional array here:

    signed int si_ValeursAdcParfaites[11];

and tried to use it as a two dimensional array here:

            pression->sd_GainOffset[i][j] = (double)(pression->si_ValeursAdcParfaites[i][j]) / (double)(pression->si_ValeursPrises[i][j] + pression->sd_GainOffset[5][j]);
#4