Computer-bookfor

الخميس، 15 ديسمبر 2011

DataSet

A data set (or dataset) is a collection of data, usually presented in tabular form. Each column represents a particular variable. Each row corresponds to a given member of the data set in question. It lists values for each of the variables, such as height and weight of an object or values of random numbers. The data set may comprise data for one or more members, corresponding to the number of rows.

Historically, the term originated in the mainframe field, where it had a well-defined meaning, very close to contemporary computer file. This topic is not covered here.

In the simplest case, there is only one variable, and then the data set consists of a single column of values, often represented as a list.

The values may be numbers, such as real numbers or integers, for example representing a person's height in centimeters, but may also be nominal data (i.e., not consisting of numerical values), for example representing a person's ethnicity. For each variable, the values will normally all be of the same kind. However, there may also be "missing values", which need to be indicated in some way.

In statistics data sets usually come from actual observations obtained by sampling a statistical population, and each row corresponds to the observations on one element of that population. Data sets may further be generated by algorithms for the purpose of testing certain kinds of software.

While the term suggests a relationship to set theory it should not be assumed that a given data set is, in fact, a set in the usual mathematically sense. The rows of a data set need not be distinct, and so a data set is technically a multiset.

From Wikipedia, the free encyclopedia

Source: http://vbnetsample.blogspot.com/2007/11/dataset.html

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We now have Intel Atom processors to power Tablets and Handhelds

Source: http://feedproxy.google.com/~r/jsbi/~3/3s1n3LWXPFQ/we-now-have-intel-atom-processors-to.html

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الأربعاء، 14 ديسمبر 2011

Seagate Unveils the First Hard Disk Drive Featuring 1 TB Per Platter

Seagate Unveils The World's First Hard Drive Featuring 1 TB Per Platter May 3, 2011 – Seagate Technology LLC unveiled the world?s first 3.5-inch hard disk drive featuring 1TB of storage capacity per disk platter, breaking the 1TB areal density barrier to help meet explosive worldwide demand for digital content storage in both home and office.

Seagate Barracuda XT 3TB Hard Disk Drive

Seagate?s GoFlex Desk products are the first to feature the new hard disk drive, delivering storage capacities of up to 3TB and an areal density of 625 Gigabits per square inch, the industry?s highest. Seagate is on track to ship its flagship 3.5-inch Barracuda desktop hard disk drive with

Source: http://feedproxy.google.com/~r/HdDoctorBlog/~3/PznolmmTIFo/

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Windows 7 themes: ?Tis the season to decorate your desktop!

I can?t give you real boughs of holly, but hopefully the two new themes we published this week will help you make your PC look a little jollier. The first theme, Decking the Halls, unwraps a gorgeous treasure-trove of shining glass ornaments, ribbons, and sparkling tinsel. To complete the experience all you need is a mug of hot spiced cider and a warm gingerbread cookie.

Our other new holiday theme, Decorating the Trees, features festive winter touches in orchards, gardens, and forests; I like to think that it also suggests the perfume of fresh-cut fir and cedar boughs and the silence of softly falling snow.

Every December I carry the same big old cardboard boxes up from the basement, and carefully unwrap the crumpled tissue paper protecting the same delicate blown-glass ornaments. Some of these fragile baubles are mementoes of my childhood, and a treasured few are family heirlooms that I inherited from my grandmother. But just as antique ornaments? beauty is not diminished by their age, I hope that you will still enjoy last year?s theme, Holiday Lights. After all, these strings of colored lights will never burn out or wind themselves into frustrating tangles that take forever to undo.

If you?d rather contemplate the natural beauties of the season, the snowy trees, ice-encrusted coves and chilly morning light of our Winter theme may provide what you?re looking for.

If you don?t have Windows 7, or if you prefer to use a single desktop image at a time, here are some holiday and seasonal wallpapers to help make your PC festive: