[原创] 《Mathematica 演示项目记》

FreddyMusic

Smarten,Thanks for review comments and suggestion.

USA use upper comma, Europea use lower comma for three digtis seperate.
I don't know yet, what Chinese should use ?

However, I update the sample with latest Charpter two.
More review comments is good acceptable.

smarten

"USA use upper comma, European use lower comma for three digits separate.
I don't know yet, what should use in Chinese?"
This is not correct.  You'd better use spaces for this purpose in standard writing.  Here is the quote from Wiki "In representing large numbers, English texts use commas (or spaces) to separate each group of three digits. This is almost always done for numbers of six or more digits, and optionally for five (or even four) digits. (The SI writing style is to use spaces for this purpose.[13]) However, in many other languages (and in South Africa) the comma is used as a decimal separator, equivalent to the decimal point. In addition, the comma may not be used for this purpose at all in some number systems, and a space may be used to separate every three digits instead."

Or you can check more details here, http://en.wikipedia.org/wiki/Decimal_separator

FreddyMusic

I go for Knuth's work, How he choice the separator, so do I.

smarten

I did a check on Knuth's work, The Art of Programming, vol1. It used a comma at bottom, see page 517 (English version): "Incidentally, T. H. O'Beirne pointed out that the date of Easter repeats with  a period of exactly 5,700,000 years. "  Also, for vol 2, all used this way (tons of examples): for example, page 405, ... "and there are only 31,556,952,000,000" ...page 2, "it will not always have exactly 100,000 zeros, 100,000 ones, etc. In fact, chances of this are quite slim; a sequence of such sequences will have this character on the average. "
In Knuth's another book, concrete mathematics, p76, I also found that he used 1,000 in a Table. In his other book: Mathematics for the Analysis of Algorithms, there is no such cases with large number for identification of usage.  

I did not do exhausted check on Donald E. Knuth's work because I did not read his book in the past and just did search from pdf and djvu files.  Please correct me if I am wrong.
43# FreddyMusic

FreddyMusic

The previous concern for an upper comma is try to avoid confusing with dot of zero.

For Example:  134 678.456        ( Spacer )
                     134'678.456        ( Upper comma)
                     134,678.456        ( Lower comma)

Of course, If we are looking carefully, it's clear.
However, a lot of readers are just scan the pages, lower comma and dot is quite similar.

smarten

out of context!

FreddyMusic

It's some out of box thinking ? Anyhow, I am still thinking about the style.

I don't think the high frequence that dot and sperator comma would appears together.

Snowlotus1987

good !

FreddyMusic

Thanks！

wangrenliang

学习学习，

李红梅

支持一下，加油，有想法就有实际行动！

amor214

真是小强！~

nklaijiayu

书名有意思～

天下无苕

不错不错，强烈支持lz，
希望lz快点把后面的给些写出来，最好是能和大家分享一下。
呵呵~~~！！！

wzy199981

支持楼主的专业和执着！！

seagullking

下载连接还在？

我怎么下不了？

谢谢搂主

xuzhengji

很强悍，很喜欢，还是应该分到专业书籍一类，用这个娱乐还是太费脑了