multiplication

I would like to compute the product of the next n adjacent elements of a matrix. The number n of elements to be multiplied should be given in function's input. For example for this input I should compute the product of every 3 consecutive elements, starting from the first. [p, ind] = max_product([1 2 2 1 3 1],3); This gives [1*2*2, 2*2*1, 2*1*3, 1*3*1] = [4,4,6,3] . Is there any practical way to do it? Now I do this using: for ii = 1:(length(v)-2) p = prod(v(ii:ii+n-1)); end where v is the input vector and n is the number of elements to be multiplied. in this example n=3 but can take any

I am having trouble getting divide and conquer matrix multiplication to work. From what I understand, you split the matrices of size nxn into quadrants (each quadrant is n/2) and then you do: C11 = A11⋅ B11 + A12 ⋅ B21 C12 = A11⋅ B12 + A12 ⋅ B22 C21 = A21 ⋅ B11 + A22 ⋅ B21 C22 = A21 ⋅ B12 + A22 ⋅ B22 My output for divide and conquer is really large and I'm having trouble figuring out the problem as I am not very good with recursion. example output: Original Matrix A: 4 0 4 3 5 4 0 4 4 0 4 0 4 1 1 1 A x A Classical: 44 3 35 15 56 20 24 35 32 0 32 12 29 5 21 17 Divide and Conquer: 992 24 632 408

I'm making a script which gives the factorial for a inserted number, but i'm having some problems with the multiplication. Note: the factorial for is given by: 9!=9*8*7*6*5*4*3*2*1 Here's my code: #!/bin/bash echo "Insert an Integer" read input if ! [[ "$input" =~ ^[0-9]+$ ]] ; then exec >&2; echo "Error: You didn't enter an integer"; exit 1 fi function factorial { while [ "$input" != 1 ]; do result=$(($result * $input)) input=$(($input-1)) done } factorial echo "The Factorial of " $input "is" $result it keeps giving me errors of all kinds for diferent multiplication technics :/ Currently the

In an Android app, I'm using two EditText controls and multiplying their two values. If one EditText is null and in the second one I put a value, it's not working properly. How can I deal with this case, in which I have a value in one EditText and a null in the other and I want to multiply the two values? First of all, you need to have a trigger for when to perform the calculation. Say it's a button, or, even better, every time the value of one of your EditText s changes: private EditText editText1, editText2; private TextView resultsText; ............................... // Obtains references

This question already has an answer here: Catch and compute overflow during multiplication of two large integers 11 answers 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 me above simple solution also looks correct. Thats why I am asking this question. ams It's easy to prove this is wrong by

My output is like this - ruby-1.9.2-p290 :011 > 2.32 * 3 => 6.959999999999999 And I remember sometime back on another machine I had got it like.. 2.32 * 3 = 6 What is my mistake? Thanks a ton for reading this. :) If you really want to round down to an integer then just (3 * 2.32).to_i but I think that's unlikely. Usually you just want to format the slightly imprecise floating point number to something like this "%0.2f" % (3 * 2.32) => "6.96" If you really want to work with the exact representation then you can use BigDecimal . require 'BigDecimal' (3 * BigDecimal.new("2.32")).to_s("F") => "6