A packed array of 64-bit floating-point values. An array specifically designed to hold 64-bit floating-point values. Packs data tightly, so it saves memory for large array sizes. If you only need to pack 32-bit floats tightly, see [PackedFloat32Array] for a more memory-friendly alternative. Constructs an empty [PackedFloat64Array]. Constructs a [PackedFloat64Array] as a copy of the given [PackedFloat64Array]. Constructs a new [PackedFloat64Array]. Optionally, you can pass in a generic [Array] that will be converted. Appends an element at the end of the array (alias of [method push_back]). Appends a [PackedFloat64Array] at the end of this array. Finds the index of an existing value (or the insertion index that maintains sorting order, if the value is not yet present in the array) using binary search. Optionally, a [code]before[/code] specifier can be passed. If [code]false[/code], the returned index comes after all existing entries of the value in the array. [b]Note:[/b] Calling [method bsearch] on an unsorted array results in unexpected behavior. Clears the array. This is equivalent to using [method resize] with a size of [code]0[/code]. Returns the number of times an element is in the array. Creates a copy of the array, and returns it. Assigns the given value to all elements in the array. This can typically be used together with [method resize] to create an array with a given size and initialized elements. Searches the array for a value and returns its index or [code]-1[/code] if not found. Optionally, the initial search index can be passed. Returns [code]true[/code] if the array contains [code]value[/code]. Inserts a new element at a given position in the array. The position must be valid, or at the end of the array ([code]idx == size()[/code]). Returns [code]true[/code] if the array is empty. Appends an element at the end of the array. Removes an element from the array by index. Sets the size of the array. If the array is grown, reserves elements at the end of the array. If the array is shrunk, truncates the array to the new size. Reverses the order of the elements in the array. Searches the array in reverse order. Optionally, a start search index can be passed. If negative, the start index is considered relative to the end of the array. Changes the float at the given index. Returns the number of elements in the array. Returns the slice of the [PackedFloat64Array], from [code]begin[/code] (inclusive) to [code]end[/code] (exclusive), as a new [PackedFloat64Array]. The absolute value of [code]begin[/code] and [code]end[/code] will be clamped to the array size, so the default value for [code]end[/code] makes it slice to the size of the array by default (i.e. [code]arr.slice(1)[/code] is a shorthand for [code]arr.slice(1, arr.size())[/code]). If either [code]begin[/code] or [code]end[/code] are negative, they will be relative to the end of the array (i.e. [code]arr.slice(0, -2)[/code] is a shorthand for [code]arr.slice(0, arr.size() - 2)[/code]). Sorts the elements of the array in ascending order. Returns a copy of the data converted to a [PackedByteArray], where each element have been encoded as 8 bytes. The size of the new array will be [code]float64_array.size() * 8[/code].