Limitation of function EXP()

[RhoSigma]

I've updated the EXP wiki page, but there's a limit for type _FLOAT too (709,....).

However, you don't necessarily need to DIM AS _FLOAT, you can also specify literal numbers as _FLOAT by appending the respective type suffix (##) to the number, e.g. EXP(567.89##)

[Jack]

Code: (Select All)

// EXP
double func_exp_single(double value) {
    if (value <= 88.02969) {
        return exp(value);
    }
    error(6);
    return 0;
}
long double func_exp_float(long double value) {
    if (value <= 709.782712893) {
        return exp(value);
    }
    error(6);
    return 0;
}

@SMcNeill

in this statement: if (value <= 709.782712893)
what if value is -11356 for example?
I think that it needs to be something like the following

Code: (Select All)

long double func_exp_float(long double value) {
    if (fabsl(value) <= 11355) {
        return exp(value);
    }
    error(6);
    return 0;
}

[jcm]

Code: (Select All)

// EXP
double func_exp_single(double value) {
    if (value <= 88.02969) {
        return exp(value);
    }
    error(6);
    return 0;
}
long double func_exp_float(long double value) {
    if (value <= 709.782712893) {
        return exp(value);
    }
    error(6);
    return 0;
}

@SMcNeill

in this statement: if (value <= 709.782712893)
what if value is -11356 for example?
I think that it needs to be something like the following

Code: (Select All)

long double func_exp_float(long double value) {
    if (fabsl(value) <= 11355) {
        return exp(value);
    }
    error(6);
    return 0;
}

The limitation is with the definition of the maximum double 1.7976E+308

the maximum number = ln(1.7976E308)=709.78177061

[RhoSigma]

Once again updated/clarified the EXP wiki page. Got a bit confused by the C++ function names respectively passed parameter types.

In fact @Jack was right, EXP is not really supporting _FLOAT precision, although you may pass such a value, it's still limited to 709.something, as DOUBLE runs through the same C++ function and so the limit of the smaller type must be taken.