Blogs
Using Uninitialized Memory for Fun and Profit
Returning to the original exercises, it is trivial to change the set into a vector (or matrix) by making dense an array of index-value pairs instead of just indices. Alternately, one might add the value to the sparse array or to a new ...
Hacker challenge II - Finding best fit in a sparse array
Summary: we have an array that has gaps, ie, there are entries for some ... Let A be the array. ... is space and time efficient so that we can find entries ...
Do You Even Know What Customer Service Means?
I’m amazed at what some companies call customer service. It’s like they think it’s the customer’s responsibility to figure things out, and that even the lamest excuse for an attempt at communication satisfies their obligation. ...
Sparse Matrices
In space array indices are permitted for a larger set, but those values actually added to the array consume memory. Thus the program can ask for Sparse Array [5] or Sparse Array [200], but the memory be allocated for only a small number ...
Performance Optimization of Arrays - Part II
“JavaScript arrays are sparse arrays”– JavaScript allows arrays to be sparse therefore, when you write arrayObj = new Array(100); unlike C runtime, JScript doesn’t allocate any slot/memory for those 100 entries up front. ...
Algorithms and Data Structures - Index by Type [NIST]
... hash table; hB-tree; heap; height-balanced binary search tree; height-balanced tree; hidden Markov model; HMM; huge sparse array; hypergraph; incremental hashing; index file; inverse suffix array; inverted file index; inverted index ...
Music Over a Lifetime, Part 1
I’ve always listened to music. Mom and Dad sang in the church choir, and we had record players in our home from as far back as I can remember. I’ve characterized my place in the musical timeline as “old enough to want to go to Woodstock ...
Dictionary of Algorithms and Data Structures [NIST]
... HMM: see hidden Markov model; homeomorphic; horizontal visibility map; Horner’s rule; Horspool: see Boyer-Moore-Horspool; hsadelta; Huffman coding; huge sparse array; Hungarian algorithm: see Munkres’ assignment algorithm ...
Panasonic DVD-LV75 Portable DVD Player
The silver top panel contains a somewhat sparse array of control buttons, including the one flaw we found with this player: an awkward, thumb-size navigation tool that pivots left and right, up and down. Fortunately, a cool, mini remote ...
Algorithms and Data Structures - Index by Area [NIST]
... formal language [D]; fractional solution [D]; fully polynomial approximation scheme [T]; halting problem [P]; huge sparse array [S]; incompressible string [D]; information theoretic bound [D]; interactive proof system [D] ...
A lock-free, wait-free, counting table
First, we hash into the array somewhere (sparse-array trick); I use & as it’s much faster than %; Next, we test if the key is already there (if it is, drop out, increment and done); If not, we try to insert the key using CAS against ...
Issues in writing a VM - Part 3 - State and Memory
However, it is much easier to keep the memory in a python dict as well, and treat that dict as if it was a sparse array. This implementation allows programs to write at address 10, and at address 10000, without requiring the VM to keep ...
Data management and GTK f (ver. zfuncs+v.18)
search and sort, queue, sparse array, GTK dialog builder, pixbuf rotate, etc. About this version + code changes for compatibility with recent gcc, c-lib, and gtk2 updates + popup_command() - run shell command with output to popup window ...
Cherry Trees, Shadblow and Global Warming
... it use to hold special significance. There is one across the small field directly opposite the kitchen window. It is blooming now, too, wearing its white flowers in sparse array. First week of April. I bet the shad are running.
They are long-lived and may have reservations about the Brazilian ...
They are long-lived and may have reservations about the Brazilian reefs has existed for a sparse array, when the entire array by combining pairwise phase differences. Hopefully the anemone to move about the fringing reef than in the ...
C Syntactic Surprises
It makes sense and looks quite nice for allocating static configurations, but wouldn't have thought to try it without an example: /// Example of cool C syntax for statically populating sparse array of structs. #include ...
jcreed @ 2008-03-14T15:02:00
A cute sparse array implementation.
101 new messages in 38 topics - abridged
would only make sense for very sparse array. - Mon, Apr 28 2008 2:52 pm 3 messages , 3 authors http://groups.google.com/group/comp.lang.java.programmer/t/261b42daa8ea9876?hl=en. Real hash functions in Java - 3 new ...
Writing the Novel
I’ve always had this idea that I could write. For years I’ve thought that someday I would write a novel, and I’ve collected ideas and “thought snippets” I figured could be useful. The big issue with writing isn’t grammar, ...
Sound encoding in the rat: a lesson about sparse vs. dense ...
The world holds an infinite array of things to see, hear, touch, etc., yet your brain only has a finite number of neurons to encode them. How is this infinite diversity assimilated by a machine with finite components? ...
Performance Optimization of Arrays - Part I
In JScript world, Arrays can be sparse, that means an Array can be of length 1 million but it may not have storage committed for all those 1 million indexes. But in real world scenarios, Arrays are hardly used as sparse arrays. ...
FontStudio Support
... quickly become a problem when you have multiple fonts. So, I came up with a simple and elegant solution for this problem by using a sparse array. It will only have the number of elements that have been actually used and my implem [...]
sudoku
ie, it takes a 9x9 sparse array... and inputs for the array... using the rules it has to output the solution.... RULES: 1.no element can repeat itself in a row. 2.no element can repeat itself in the column. ...
Iterators?
All I have to do is write the Life part of the program, which hopefully will be easier that the Sparse Array matrix and the iterators. But we'll see. I should've done that during the week, or, like, yesterday, but it's hard to work ...
reading integer text matrix into real array
Summary: Greetings -- I have a sparse matrix in Harwell-Boeing format, ... Fortran runtime error: Expected INTEGER for item 2 in formatted ... -- at the read loop line above. ...
Explain Sparse Matrix...
The natural method of representing matrices in memory as two-dimensional arrays may not be suitable for sparse matrices. That is one may save space by storing only those entries which may be nonzero. If this is done, then the matrix may ...
Algo and programming
Given an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like. [ I ended up giving about 4 or 5 different solutions for this, ...
Hate management?
Re: arrays/maps. An array indexed by character ID [i]is[/i] a map. It'll be a rather sparse array, incidentally, but it's still conceptually a map. BTW, comparisons over IDs and pointers are not of linear cost.[/quote] I know full well w.
Enigma 1469
Convert the adjacency matrix to a set of rules that allow me to add a "tooltip" to each node of the corresponding the graph so that it can be explored by hovering the mouse over the graph: (1) extract the sparse array form of the ...
Life hectic, blogging sparse.
The sort of people who put out fires Like to play in tumble dryers; Those with cautious dispositions Train as florists or opticians. Popular Handbag by Array for Popular Handbag.
Multidimensional arrays in Javascript
Multidimensional arrays are useful tools in circumstances where you have to populate the entire space with information. If your data is more sparse -- meaning most of the cells are empty -- then you're better off using associative ...
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Sparse arrays
Another way to do it is with sparse arrays. Sparse array is implemented by a sequence of cascading arrays and breaking the index into groups of bits. The top level array is indexed by the very first group of bits, and contains pointer ...
Case Structure and property nodes
For those of you turned off by my sparse program, i took out the build array function attached to a boolean constant inside the case structure, because I realized that wasn't correct. You need to know that things wired to the outside of ...
Memcached set invalidation
The classic means of reducing a large, sparse array to a small, denser one is hashing. That is, rather than using the key get_items_in_cart::13:10:30 , we might hash it to get_items_in_cart::13/x , where 'x' is a number from 1 to 4. ...
Site Change
The following pairs represent indexes into the array and the non-null values stored in them. * Note: the encoder uses recursion at this point, so theoretically an excessively deep nested sparse array could cause a stack overflow, ...
Re: Faster sparse from triplets
I have written my own version of repmat for use on sparse arrays, > because the default implementation creates big ones arrays for which > there is insufficient memory due to the dimensions involved. ...
Re: Faster sparse from triplets
gmail.com> wrote: > I have written my own version of repmat for use on sparse arrays, > because the default implementation creates big ones arrays for which > there is insufficient memory due to the dimensions involved. ...
Fast sparse graphs
The underlying implementation is an adjacency list, achieved by an array of custom made hash tables, whose buckets are rudimentary binary trees. There is an option to specify at run time the expected degree of the graph-- these tests ...
array-based index files
Tie::File seems to be prone to offset errors if revisions get sparse, # it's not that fast, either. Tie::File is also not in Perl 5.6. So # one of my favorite modules is out :< Next up would be one of the DBM ...
Data management and GTK f (ver. zfuncs+v.14)
search and sort, queue, sparse array, GTK dialog builder, pixbuf rotate, etc. About this version A new function was added to translate text messages and GUIs for non-English locles. Several functions having a user interface were ...
CS: Compressed DNA microarrays and a Compressive Sensing Imager
Here is an interesting use of sparse measurement matrices by Haris Vikalo, Farzad Parvaresh, S. Misra, and Babak Hassibi in Recovering sparse signals using sparse measurement matrices in compressed DNA microarrays. The abstract reads: ...
Re: Zend_Form multipage examples?
the documentation on implementing the multipage part is a bit sparse. I'm aware of that; I haven't had a chance to work up more advanced use cases and examples for this bit of functionality yet. A note or two below: ...
Zend_Form multipage examples?
I'm trying to put together a simple Zend_Form setup for a multipaged form, but the documentation on implementing the multipage part is a bit sparse. Once the form object is setup with the subforms, what's the "right way" to render and ...
ArrayIsDefined
Create a sparse new array. ---> SparseArray memory usage
... is that less memory is needed for sparse arrays. Unfortunately, this doesn't always seem to ...much memory is used as for an ordinary array. Can someone explain this, and hopefully tell ... memory usage for a 2 x 100million sparse array: In[1]:= MaxMemoryUsed[] MemoryInUse[] a=SparseArray[{{1,1}->1},{2,100000000}]; ... is not fine: I use the transposed array and memory usage explodes: In[1]:= ...
Re: Hacker challenge II - Finding best fit in a sparse array
...real life. Suppose we have an array that has gaps, i.e.,...(n) search if the array is sparse. Is a radix tree ....org/viewvc/pspp/src/libpspp/sparse-array.h?revision=1.4&....org/viewvc/pspp/src/libpspp/sparse-array.c?revision=1.4&... comments from the source code: /* Sparse array data structure. Implements a ... that base as the index value. */ ... /* Sparse array data structure. The ...
Re: Hacker challenge II - Finding best fit in a sparse array
... then in real life. Suppose we have an array that has gaps, i.e., there are entries... and not for others. Let A be the array. The array can be empty, sparsely filled, half filled, almost completely full, or completely full. ... be an O(n) search if the array is sparse. What is needed is some kind of ...> can handle inserts and deletes into the array. I've come up with one way to ...
Hacker challenge II - Finding best fit in a sparse array
... then in real life. Suppose we have an array that has gaps, i.e., there are ...and not for others. Let A be the array. The array can be empty, sparsely filled, half filled, almost completely full, or completely full. ... i, but this could be an O(n) search if the array is sparse. What is needed is some kind of...it can handle inserts and deletes into the array. I've come up with one way to...
Re: How to create descendants of Array class?
... might have the previous augmented array object and 'subclass' it by ... properties are insignificant. The augmented array facilities direct indexed looping and ... easily/efficiently. Whereas the aggregated (Array) object (although just aggregated through ...-in iteration of the aggregated (Array) object, Which may be valuable ... to be used as a sparse array (for efficiency). The vast...
Re: Creare un'array molto grande
... probabilmente saranno per buona parte vuote (come le celle di un forglio di calcolo) di usano strutture chiamate Sparse Array http://en.wikipedia.org/wiki/Sparse_array L'implementazione reale ovviamente potrebbe non usare affatto gli array. Ciao Daniele -- Daniele Teti R&D Director & Educational bitTimeSoftware/CodeGear
Re: Creare un'array molto grande
...In genere allocare grosse strutture dati che probabilmente saranno per buona parte vuote (come le celle di un forglio di calcolo) di usano strutture chiamate Sparse Array http://en.wikipedia.org/wiki/Sparse_array L'implementazione reale ovviamente potrebbe non usare affatto gli array. Ciao Daniele
Re: => Robert's Illness Exposed <=
... much restricted to the occasional passing police car, commercial mobile radio, or the ultra low-level RF energies emitted by the sun and a sparse array of remotely located television and radio broadcast antennae. However, today it is virtually impossible to venture into a public place without being battered by ...
Re: Reginald DO OVER
...what a mathematician would call a "sparse array." DO OVER allows me to see the stem tails which have... the data in a dense array for further processing such as ...DO OVER language construct. */ /* Create a "Sparse Array" in a stemmed variable. ... SA.327 = 'grapes' /* Aggregate the Sparse Array data in a "Dense ... 0 /* D is the dense array. */ do j OVER SA. say ...
Re: Reginald DO OVER
...@earthlink88.net> wrote: I want to collect the data in a dense array for further processing such as sorting. Is there any point? Copying all the data around isn't going to make storing it any more efficient. /* Aggregate the Sparse Array data in a "Dense Array." */ DA.0 = 0 /* D is the dense array. */ do j OVER SA. say j SA.j k = DA.0 + ...
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