addition

问题 I encountered this problem while trying to add the values of 6 different input, I noticed that if I add 3 of them it works, but if I add more than 3 values it doesn't work. When I add 3 values between them, everything seems to work correctly but, for example, if I add 4 values, the result is like the addition between a string and a number. May I have your help please? This is my HTML code for the imput tags: document.getElementById("b").onclick = function() { var x = document.getElementById(

问题 Recently, in R2016b a feature was added to MATLAB, which is causing a lot of headaches in the school where I teach. Nowadays formulae, which traditionally would be considered illegal or at least shady maths are executed successfully: [1, 2] + [3, 4]' -> [4, 5; 5, 6] [1, 2]' + [3, 4, 5] -> [4, 5, 6; 5, 6, 7] So adding a row vector to a column vector is treated as an addition of two matrices one can get from repeating the vectors up to the "suitable" dimensions. In older versions this would

问题 This question already has answers here : How many significant digits do floats and doubles have in java? (6 answers) Closed 2 years ago . I was wondering, why my simple addition of some double values leads to the following results in Java: double a = 1 + 1E-10; // 1.0000000001 (as expected) double b = 1 + 1E-15; // 1.000000000000001 (as expected) double c = 1 + 1E-20; // 1.0 (why?) I thought I can at least add a value of Double.MIN_VALUE, which seems to be 4.9E-324. What am I doing wrong here

问题 This question already has answers here : How many significant digits do floats and doubles have in java? (6 answers) Closed 2 years ago . I was wondering, why my simple addition of some double values leads to the following results in Java: double a = 1 + 1E-10; // 1.0000000001 (as expected) double b = 1 + 1E-15; // 1.000000000000001 (as expected) double c = 1 + 1E-20; // 1.0 (why?) I thought I can at least add a value of Double.MIN_VALUE, which seems to be 4.9E-324. What am I doing wrong here

问题 Right off the bat - no, this is NOT homework. I would like to write a prefix notation parser in python (for sums presently)... for example if given: + 2 2 it would return: 4 ideas? 回答1: def prefix(input): op, num1, num2 = input.split(" ") num1 = int(num1) num2 = int(num2) if op == "+": return num1 + num2 elif op == "*": return num1 * num2 else: # handle invalid op return 0 print prefix("+ 2 2") prints 4, also included a multiplication operator just to show how to expand it. 回答2: Prefix

问题 I have a nx1 vector and a 1xn vector. I want to add them in a special manner like matrix multiplication in an efficient manner (vectorized): Example: A=[1 2 3]' B=[4 5 6] A \odd_add B = [1+4 1+5 1+6 2+4 2+5 2+6 3+4 3+5 3+6 ] Regards 回答1: You can use bsxfun: A=[1 2 3]' B=[4 5 6] bsxfun(@plus, A, B) The result is ans = 5 6 7 6 7 8 7 8 9 回答2: You can use the repmat function (replicate matrices): repmat(A,1,3)+repmat(B,3,1) 来源： https://stackoverflow.com/questions/11690743/how-to-add-a-row-vector

问题 I'm using the following piece of code and under some mysterious circumstances the result of the addition is not as it's supposed to be: double _west = 9.482935905456543; double _off = 0.00000093248155508263153; double _lon = _west + _off; // check for the expected result Debug.Assert(_lon == 9.4829368379380981); // sometimes i get 9.48293685913086 for _lon (which is wrong) I'm using some native DLLs within my application and i suspect that some DLL is responsible for this 'miscalculation',

问题 I am wondering about how many times this while loop would execute. This is a function that adds two numbers using XOR and AND. def Add(x, y): # Iterate till there is no carry while (y != 0): # carry now contains common # set bits of x and y carry = x & y # Sum of bits of x and y where at # least one of the bits is not set x = x ^ y # Carry is shifted by one so that # adding it to x gives the required sum y = carry << 1 return x `` 回答1: Algorithm for No Carry Adder : function no_carry_adder(A

问题 I have a long string, which is basically a list like str="lamp, bag, mirror," (and other items) I was wondering if I can add or subtract some items, in other programming languages I can easily do: str=str-"bag," and get str="lamp, mirror," this doesnt work in python (I'm using 2.7 on a W8 pc) Is there a way to split the string across say "bag," and somehow use that as a subtraction? Then I still need to figure out how to add. 回答1: you could also just do print "lamp, bag, mirror".replace("bag,

问题 I am creating an EXP multiplier and I do not know how to separate multipliers. My Aim: My aim is to make it so that the multiplier from 'checkbox5.checked = true' will not multiply by the rest of checkboxes but just add its product. If 'checkbox1.checked = true' it will multiply the EXP, which is the input amount by 2. So if checkbox4 is checked, it will multiply the EXP by 1.5 again. So 2x1.5 = 3 However for checkbox5, which multiplier is x1.1, I do not want it to be multiplying the rest of