multiplication

问题 (VB Express Level: Beginner) I want to do following, A column from Workbook 1 a b c d A column from Workbook2 e f g h Output to a single cell ae+bf+cg+dh (The output is a Sumproduct.) There are 44 rows in workbook 1 and 44 rows in workbook 2. But there are 3 columns in workbook 1 and 104 columns in workbook 2. Each column in workbook 3 must be multiplied with 104 columns from workbook 2. Following is my effort, which writes sames values in all the cells of a column. My understanding is my for

问题 I am currently developing a class to represent matrices, it represents any general mxn matrix. I have worked out addition and scalar multiplication but I am struggling to develop the multiplication of two matrices. The data of the matrix is held in a 2D array of doubles. The method looks a little bit like this: public Matrix multiply(Matrix A) { ////code } It will return the product matrix. This is multiplication on the right. So, if I called A.multiply(B) then it would return the matrix AB,

问题 This question already has answers here : Is multiplication and division using shift operators in C actually faster? (18 answers) Closed 5 years ago . Where it's possible to do so, I'm wondering if it's faster to replace a single multiplication with a bitshift followed by an integer division. Say I've got an int k and I want to multiply it by 2.25. What's faster? int k = 5; k *= 2.25; std::cout << k << std::endl; or int k = 5; k = (k<<1) + (k/4); std::cout << k << std::endl; Output 11 11 Both

问题 I am learning assembly for x86 using DosBox emulator. I am trying to perform multiplication. I do not get how it works. When I write the following code: mov al, 3 mul 2 I get an error. Although, in the reference I am using, it says in multiplication, it assumes AX is always the place holder, therefore, if I write: mul, 2 It multiplies al value by 2. But it does not work with me. When I try the following: mov al, 3 mul al,2 int 3 I get result 9 in ax. See this picture for clarification:

问题 This question already has answers here : Catch and compute overflow during multiplication of two large integers (12 answers) Closed 5 years ago . int isOverflow(uint a, uint b) { // a and b are unsigned non-zero integers. uint c = a * b; if (c < ( a > b ? a : b)) return 1; else return 0; } Am I missing something ? I think the above snippet will work. EDIT : I have seen other solutions like multiplication of large numbers, how to catch overflow which uses some fancy methods to check it. But to

问题 I am trying to implement Long Hand Multiplication method for 8 bit binary numbers stored in two arrays BeforeDecimal1 and BeforeDecimal2 . The problem is I always get the wrong result. I tried to figure out the issue but couldn't do it. Here is the code: This is a much more refined code then previous one. It is giving me result but the result is not correct. int i=0,carry=0; while(true) { if(BeforeDecimal2[i]!=0) for(int j=7;j>=0;j--) { if(s[j]==1 && BeforeDecimal1[j]==1 && carry==0) { cout<<

问题 This question already has answers here : Creating uniform random quaternion and multiplication of two quaternions (2 answers) Closed 3 years ago . I have two quaternions: Q1= w0, x0, y0, z0 and Q2 = w1, x1, y1, z1. I would like to multiply them by using NumPy or Python function which can return 2-d array. I found some pseudocodes on the internet which is written by Christoph Gohlke to do this kind of multiplication. I tried a lot but failed to apply it. Can anyone help me please to do this

问题 I have arrays of Doubles which need to be multiplied with each other and with some constant value(s). Array1 = [1.002, 1.009, 1.016 , 1.019] Array2 = [106, 109, 113 , 119] Constant1 = 6.54 The output what I need is an array and derived by multiplying the above input data: ResultArray = [694.626, 719.276, 750.844, 793.047] In the application there is a massive amount of these calculations and speed is the key. With .NET what is the optimal way to get the ResultArray? 来源： https://stackoverflow

问题 as part of an assignment i have been trying to multiply two 32 bit numbers and store the result in a 64bit place. However, my result is incorrect. please help me figure why [org 0x0100] jmp start multiplicand: dd 100122,0 multiplier: dd 66015 result: dd 0,0 start: initialize: mov cl,16 mov bl,1 checkbit: test bl,[multiplier] jz decrement multiply: mov ax, [multiplicand] add [result],ax mov ax, [multiplicand+2] adc [result+2], ax mov ax, [multiplicand+4] adc [result+4], ax decrement: shl bl,1

问题 Recently, I've tried creating a for loop that multiplies each integer in the list and returns each sequential product until the overall product of all integers is given. import operator from operator import mul from functools import reduce s = list(map(int, input('Enter numbers WITH SPACES: ').split(' '))) progression_product = []; for i in s: progression_product.append(reduce(mul, s[0:i])) #This loop below removes repeating results. As for progressive order multiplication of positive