addition

I have a method that looks like this: float * mutate(float* organism){ int i; float sign = 1; static float newOrg[INPUTS] = {0}; for (i = 0;i<INPUTS;i++){ if (rand() % 2 == 0) { sign = 1; } else { sign = -1; } float temp = (organism[i] + sign); printf("bf: %f af: %f diff: %f sign: %f sign2: %f temp: %f\n\n", organism[i], (organism[i] + sign), (organism[i] + sign)-organism[i], sign, sign+sign, temp); newOrg[i] = organism[i] + sign; } return newOrg; } When sign is not 0 the first two "%f" s are the same and the 3rd is 0, also putting the sum in a variable didn't help. This is baffling me! I can

I'm having a hard time explaining this one. The following function is being used as a worksheet formula. A value of "empty" simply means that the cell was empty and, therefore, there is no value. Given the values {empty, empty, 0.8, 0.2}, the following function is sometimes returning off the wall values like 5.55111512312578E-17. In the debugger, it looks like everything is correct until the last value in the ParamArray (in this case 0.2) is processed. Any thoughts? Private Function getOvertimeEP(ParamArray epAllocations() As Variant) Dim overtimeEP As Double overtimeEP = -1 For Each nextVal

I have a vector v<-c(1,2,3) I need add the numbers in the vector in the following fashion 1,1+2,1+2+3 producing a second vector v1<-c(1,3,6) This is probably quite simple...but I am a bit stuck. Use the cumulative sum function: cumsum(v) #[1] 1 3 6 来源： https://stackoverflow.com/questions/12114127/adding-numbers-within-a-vector-in-r

Is there a way to construct a vector as the concatenation of 2 vector s (Other than creating a helper function?) For example: const vector<int> first = {13}; const vector<int> second = {42}; const vector<int> concatenation = first + second; I know that vector doesn't have an addition operator like string , but that's the behavior that I want. Such that concatenation would contain: 13 and 42. I know that I can initialize concatenation like this, but it prevents me from making concatenation const : vector<int> concatenation = first; first.insert(concatenation.end(), second.cbegin(), second.cend(

folks! I've encountered a little problem: I'm doing a simple addition with three double values. The result has a smaller precision than the used values. double minutes = 3; minutes = minutes / (24.0*60.0); // contains 0.00208333 double hours = 3; hours = hours / 24.0; // contains 0.125 double days = 3; // contains 3 double age = days + hours + minutes; // result is 3.12708 I found no way to avoid this behaviour. Nothing seems to be wrong with the calculation as what the comments on your post said. If you'd like to see more precision consider looking up setprecision() There is no problem. The

Assuming points are represented using JavaScript Array as [x,y] , how could I define the + operator on points such that: [1,2] + [5,10] == [6,12] JavaScript does not have a facility for overriding the built-in arithmetic operators. There are some limited tricks you can pull by overriding the .valueOf() and .toString() methods, but I can't imagine how you could do what you're asking. You could of course write a function to do it. How about a nice 'plus' method? This doesn't care how many indexes either array has, but any that are not numeric are converted to 0. Array.prototype.plus= function

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 have produced an error message informing that the addition of matrices with different dimensions is not

I'm new in Delphi. For a project required by my company, I need to translate some code from our existing C++ classes to Delphi. Some of these classes are templates, such as: template <class T> struct APoint { T m_X; T m_Y; virtual void Add(T value); }; template <class T> void APoint<T>::Add(T value) { m_X += value; m_Y += value; } I use it e.g. with this code APoint<float> pt; pt.m_X = 2.0f; pt.m_Y = 4.0f; pt.Add(5.0f); and this works well. Now I need to write equivalent code for Delphi. I tried to write a Delphi Generic class, based on the C++ code above: APoint<T> = record m_X: T; m_Y: T;

I have a 3XN matrix representing a list of 3D coordinates,something like 33 33 33 33 34 34 34 34 34 35 35 17 18 19 20 16 17 18 19 20 16 17 10 10 10 10 10 10 10 10 10 10 10 I want to shift all coordinates by some vector v=[1 2 3] , that is add the 3D vector to each column of the matrix. I know how to do that with a for loop, but how can I do it without a loop? Surely there's a way... you mean like this? D=[33 33 33 33 34 34 34 34 34 35 35; 17 18 19 20 16 17 18 19 20 16 17; 10 10 10 10 10 10 10 10 10 10 10 ]; A=[1 2 3]'; C= bsxfun(@plus, D, A) C = 34 34 34 34 35 35 35 35 35 36 36 19 20 21 22 18