ddmathparser

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I am new to programming. I want to add some new functions such as derivatives and integrations to ddmathparser . The only one I can

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am wondering if there are any nice Mathematical Parsers in Swift. That is, it can take a string and solve it. I need it to have factorials, exponents, square roots, and all the basic arithmetic operators. I want it to be built into Swift, not 3rd party(like DDMathParser and GCMathParser)It would be nice if you

问题 I'm looking to get tokens back from a string (to aid in editing) and referring to the answer here iOS DDMathParser Get Number 'Blocks' it appears that this functionality may be deprecated. What is the most up-to-date way to get token objects from my string? 回答1: Ok. So, this appears to be the current way of getting tokens from a string: NSError *error = nil; DDMathOperatorSet *opSet = [DDMathOperatorSet defaultOperatorSet]; DDMathStringTokenizer *tokenizer = [[DDMathStringTokenizer alloc]

问题 I'm registering a summation function that is sum(expression,initial,final) . The expression contains the independent variable x and the initial and final are integers. For example, sum(2x,2,4) should return 2*2+3*2+4*2= 18 . However, I have trouble substituting x in the expression for every value between initial and final . Here are my code and it doesn't work. Can anyone tell me how to fix it? //sum(expr (dependent on x),initial,final) [evaluator registerFunction:^DDExpression *(NSArray