how to generate random isotropic vectors using R?
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I would like to ask,if some of You dont know any simple way to solve this kind of problem: I need to generate all combinations of A numbers taken from a set B (0,1,2...B), with their sum = C. ie if A=2, B=3, C=2: Solution in this case: (1,1);(0,2);(2,0) So the vectors are length 2 (A), sum of all its items is 2 (C), possible values for each of vectors elements come from the set {0,1,2,3} (maximum is B).
Answer:
z <- expand.grid(0:3,0:3) z[rowSums(z)==2, ] Var1 Var2 3 2 0 5 1 1 7 0 2 If you wanted to do the...
user1359552 at Stack Overflow Mark as irrelevant Undo
Other solutions
I'm trying to generate vectors for altitude and density from 0-30 km in increments of 1 km using a FOR LOOP. I have density as 'd' and altitude as 'z' and d=1.42 e ^ -0.141z . I am having a difficult time in developing the program and get errors no matter...
Answer:
You're on the right track. First of all, notice this error your code: altitude(k)=altitude. You're telling...
Racceee Girl <333 at Yahoo! Answers Mark as irrelevant Undo
Hello, I am assigned to solve a few Elementary Vectors using both graphical or analytical method. My professor hasn't gone over how to solve vectors using the analytical method and I need some helps understanding the steps to do so. For example, how...
Answer:
Let A,B be vectors in R{n}, so that formally A = {A_1, ... , A_n} B = {B_1, ... , B_n} A + B = { A_...
Hana at Yahoo! Answers Mark as irrelevant Undo
I use my real player to download video from youtube, I have a windows 7 system. But once I downloaded it I can't seem to generate any thumbnails, I can still play the video. It seems any FLV format of video it won't show any thumbnails. Is there anyway...
Answer:
*********************************no other way sorry***********************************… Get free...
Todd Jackson at Yahoo! Answers Mark as irrelevant Undo
Hi, I was assigned a project to draw two rectangles using plot lines and rotating them by creating vectors for the x and y values using the variables on the rectangle using sin and cos. I have already plotted the lines but the rotation is not showing...
Answer:
There are a couple errors I see. Your x vector (x = [2;5;3;5]) is incorrect. As defined earlier the...
McDonald at Yahoo! Answers Mark as irrelevant Undo
What i mean by vector here is a 1-d array of size length 3(not the vector container in CPP). Means float a[3],b[3],c[3]; Now suppose we want to store cross product of a and b into array c, how will we do it using a function? The function arguments (inputs...
Answer:
I used class for doing this vectorsHere v1 and v2 were two vectors provided by user and cross_p is the...
Chinmay Shah at Quora Mark as irrelevant Undo
Answer:
a: vector = [1:1:20] b: vector = [0:(pi()/100):2*pi()] (can't quite remember the syntax for pi on matlab...
George at Yahoo! Answers Mark as irrelevant Undo
I want to generate a .so file using the above project for use on Android so that I can interface the hardware with arm architecture.
Answer:
.so Library files are shared object files and are created when compiled the C/C++ program with gcc compiler...
Sravan Sai at Quora Mark as irrelevant Undo
I have data matrix X where each column is an individual observation. I ran SVD and generated U,S and V matrices such that .[math] X=USV^T [/math]. Now I want to select some columns from X that has eigen vectors closer to eigen vectors of X. How can I...
Answer:
You seem to be describing either sparse principal components (see Bair & Tibshirani 2005 for the...
Tim Triche, Jr. at Quora Mark as irrelevant Undo
hi.. I really need help here.. how can i generate report in pdf format using php language? i want the user select the date from calendar selection, and it will automatically generate report in pdf format and excel format based on the date selected.....
Answer:
There are PDF functions in PHP. Try reading the manual: http://www.php.net/manual/en/book.pdf.ph&hellip...
kakashi at Yahoo! Answers Mark as irrelevant Undo
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