36 lines
666 B
Objective-C
36 lines
666 B
Objective-C
//
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// MPFactorialTerm.m
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// MathKit
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//
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// Created by Kim Wittenburg on 15.11.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPFactorialTerm.h"
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@implementation MPFactorialTerm
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- (instancetype)initWithTerm:(MPTerm *)term
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{
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self = [super init];
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if (self) {
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NSAssert(term != nil, @"term must not be nil.");
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_term = term;
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}
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return self;
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}
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- (NSDecimalNumber *)doEvaluation:(NSError *__autoreleasing *)error
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{
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NSDecimalNumber *value = [self.term evaluate:error];
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if (!value) {
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return nil;
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}
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return [[NSDecimalNumber alloc] initWithDouble:tgamma(value.doubleValue + 1)];
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}
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@end
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