Math Utils (MT4) - MetaTrader 4 Library | MT4 EA Download - MetaTrader 4 Resources

 double ceiling( const double five); double ceiling( const double value , constant integer number); double ceiling( const double value , constant double step); double floor( const double value) double ground( const double value , const integer number); double ground( const double value ,const double step);double round(const double five ) ; double round( const double five) double the value , constant integer number); double rounded ( const double the value , constant double the step); double truncation ( const double the value, constant integer number); double truncation ( const double the value , constant integer number) ; double truncation ( const double value , const double step); double round to significant figures ( const double value , integer number); double round price ( double p price, string pSymbol = NULL); double round volume ( double p volume, string pSymbol = NULL); double strip error ( const double value );

 // Determine whether the passed in value is an integer.
Boolean is an integer ( double the value ); // Checks whether a number has the specified number of decimal places.
boolean is round ( double value , integer number); // Checks if a number is an integer multiple of a certain increment.
Boolean is round ( double value , double steps); // Get the fractional part of x (always has the same sign as x)
Double the fracturing ( double the value ); // Get the number of decimal places after the decimal point.
Integer Gets the number ( double the value ); // Gets the number of integer digits to the left of the decimal point.
Integer Gets an integer number ( double the value ); // Gets the number of significant digits, excluding leading and trailing zeros.
Integer Gets significant digits ( double the value ); // Convert a value in the range [min, max] to y in another range [destMin, destMax].
double remap ( double value , double minutes, double max, double destination minutes, double target max) // Remap values ​​on scale [min, max] to normalized scale [0, 1].
Double normalization ( double value , double minutes, double maximum); // Remap normalized values ​​[0, 1] to scales [destMin, destMax].
Double denormalization ( double the value , double the destination minutes, double the destination max) // Clamp (limit) the number to a boundary (range). T clamp(T value , T min value, T max value); // Clamp (limit) the number to the maximum value. T ClampTop(T value , T maximum); // Clamp (limit) the number to the minimum value. T ClampBot(T value , T minutes); // Wraps a value in a range between [min, max]. T wrap(T value , T min value, T max value); // Avoid divide-by-zero errors that force the mql program to stop.
Double safe Div( double a, double b); // Returns the scientific notation exponent of the number.
integer floor log 10 ( double the value ); // Returns pow(10, (int)power), using a fast lookup table to find the power.
Double the power obtained by 10 ( integer power); // The sign of the calculated value is 1, 0, -1
Double mathematical symbols ( double value );

// Returns the bit representation corresponding to a double value.
long double to long bit ( double the value ); // Returns the double value corresponding to the bit representation.
Double LongBitsToDouble( long bits); // Returns the original encoding of the exponent in the bit representation.
integer raw exponent ( double the value ); // Returns the raw encoding of the significand in bit representation.
long raw significant digits ( double's value ); // Returns the unbiased (adjusted) exponent of a double value.
integer Gets the exponent ( the value of a double ); // Returns the significand of a double value.
long Gets the significant digit ( double's value ); // Determines whether the number can be represented exactly as a double.
Boolean IsExactDouble( double's value ); // Returns the next representable value away from zero after x.
Double Next After ( double the value ); // Advance the float by the specified number of ULPs.
Double double advance ( double value , long distance); // Return the size of the ulp parameter.
double ulp( double the value ); // Returns the difference between two floating point numbers in ulp units.
long UlpDiff( double value 1, double value 2);

 // Convert the numeric value to a raw hexadecimal text string.
String double to hexadecimal ( double the value ); // Convert a numeric value to a hexadecimal floating point constant string.
String DoubleToHexFloatConstant( double's value ); // Convert a numeric value to an exact decimal text string.
String DoubleToStringExact( double's value ); // Convert a numeric value to a string in scientific notation.
StringDoubleToExponential ( const doubleValue , integer number = - 1 ); // Convert a numeric value to its shortest round-trip string representation.
string represents ( double's value ); string represents ( float's value ); // Format a double using the thousands separator and the specified decimal.
string format double( const double number, const integer number, const string separator = "," );

Sometimes, when comparing two double-precision numbers that are assumed to be equal but were calculated differently, the comparison goes wrong. In fact, the difference between A and B is very small (16th decimal place) due to binary rounding error, so exact comparisons ( == , != , > , >= , < , <= operators) fail.

Compare doubles derived from different calculations:

 if (0.1+0.2 == 0.3) // false

 if (new_sl> Order Stop ()) if (new_sl< Order Stop ())

 if ( bid >= hide take profit) if ( ask <= hide take profit)

 if ( ask < virtual stop) if ( bid > virtual stop)

To avoid unexpected results, it is better to replace exact comparisons ( == , != , > , >= , < , <= ) with loose comparisons to overcome floating point inaccuracies. This small library provides the required functionality.

//--- Exact comparison may fail
if (required < virtual_stopLoss) if (bid > virtual_stopLoss) if ( 0.1 + 0.2 == 0.3 ) // false

//--- Using library functions, the results are as expected
if (LT(ask, virtual_stopLoss)) if (GT(bid, virtual_stopLoss)) if (EQ ( 0.1 + 0.2 , 0.3 )) // true

Attachment download

📎 debug_demo.mq4 (4.63 KB)

📎 math_test.mq4 (29.21 KB)

📎 normalizedouble_errors.mq4 (2.51 KB)

📎 pitfalls.mq4 (3.91 KB)

📎unnormalized_quotes.mq4 (6.17 KB)

📎 math_utils.mqh (72.99 KB)

Source: MQL5 #25723