[Schneider]

I just tested it with some random generated coordinates.and the function works good as it should...
Are you sure the house-coordinates are stored correctly and are you using the function correctly? Can you show us the command where you use this function?

Edit: This is the code I used to test it:

//Top of script:

pawn Код:

enum hinfo
{
    Float:EHouseX,
    Float:EHouseY,
    Float:EHouseZ
};
new Houses[90][hinfo];

//@ OnGameModeInit

pawn Код:

for(new i; i<90; i++)
{
    Houses[i][EHouseX] = (random(6000)-3000);
    Houses[i][EHouseY] = (random(6000)-3000);
    Houses[i][EHouseZ] = (random(30));
}

//@ OnPlayerConnect:

pawn Код:

for(new i; i<90; i++)
{
    SetPlayerMapIcon(playerid, i, Houses[i][EHouseX], Houses[i][EHouseY], Houses[i][EHouseZ], 31, 0, MAPICON_GLOBAL);
}

//Command:

pawn Код:

COMMAND:getnearesthouse(playerid, params[])
{
    new house = getClosestPizzaDelivery(playerid);
    if(house != -1)
    {
        SetPlayerCheckpoint(playerid, Houses[house][EHouseX], Houses[house][EHouseY], Houses[house][EHouseZ], 6.0);
    }
    return 1;
}

It works as it should, It shows a checkpoint at the nearest 'house'.