mozart

How do I create a list in Oz?

由 心不动则不痛 提交于 2020-01-24 04:07:48
问题 I'm trying to create a list in Oz using the following code: local Loop10 Xs in proc {Loop10 I} Xs={List.append Xs I} if I == 10 then skip else {Browse I} {Loop10 I+1} end {Browse Xs} end {Loop10 0} end The Mozart compiler shows that the code is accepted, but no Browse window opens up. All I'm trying to do is create a list in Oz. What's wrong with the code? 回答1: Not sure that that's what you want, but to create a list of all whole numbers between X and Y (inclusive) you could do: local fun

How do I create a list in Oz?

由 ☆樱花仙子☆ 提交于 2020-01-24 04:07:23
问题 I'm trying to create a list in Oz using the following code: local Loop10 Xs in proc {Loop10 I} Xs={List.append Xs I} if I == 10 then skip else {Browse I} {Loop10 I+1} end {Browse Xs} end {Loop10 0} end The Mozart compiler shows that the code is accepted, but no Browse window opens up. All I'm trying to do is create a list in Oz. What's wrong with the code? 回答1: Not sure that that's what you want, but to create a list of all whole numbers between X and Y (inclusive) you could do: local fun

How to write a simple higher order function in mozart oz?

由 戏子无情 提交于 2019-12-13 19:05:37
问题 I am a beginner in mozart oz, and I would like to write a simple higher order function, like {{Add 1}2}, the result of which has to be 3. I guess this is something like nested call in C, where a function could call itself? I am not sure how to define this function, should I write declare fun {Add I} or declare fun {{Add I}J} ? And I really don't know how to finish such a function. I have tried several times, but I never have it worked. 回答1: Something like this should work (untested): declare

Mysql索引分类

由 旧城冷巷雨未停 提交于 2019-12-05 11:07:09
在绝大多数情况下，Mysql索引都是基于B+树的，而索引可以提高数据查询的效率。 但是Mysql是如何利用B+树进行查询的呢？索引的作用只是提高查询效率吗？ Mysql中的B+Tree索引 假设有一张教师表，里面有教师编号、名字、学科、薪资四个字段。 当你执行下面这条创建索引的sql语句时： create index id_name on teacher(name); Mysql就会在磁盘中构建这样一颗B+树： 这样一棵树有什么用呢？首先当然是加速查询。 举个简单的例子，假设现在要查找名字为“Mozart”的教师的数据： select * from teacher where name = "Mozart"; 既然我们已经建立了B+树，那么就要好好利用它来加速查询，而不是傻傻的去遍历整张表。 从根节点开始，我们发现，根节点就是”Mozart”，不过很可惜，根节点上面只有name字段的信息，没有其他字段的数据。 这是B+树的一个特点——只有叶子节点（leaf nodes）会指向行数据。 我们比较了要查找的值和搜索码值，发现相等，于是跳到搜索码右边的指针指向的节点，也就是“Srinivasan”所在的节点（注意，这里的节点是指下图红色框画出的区域）。 接着，我们遍历当前节点的搜索码值，和要查找的值做比较。 我们发现“Srinivasan”已经大于我们要查找的”Mozart”了

Executing Mozart-Oz code in command line

由 一曲冷凌霜 提交于 2019-12-03 13:49:23
问题 I'm trying to use Mozart Oz. I download the execution binary from source forge: http://sourceforge.net/projects/mozart-oz/. When launching Mozart.app, the emacs (aquamacs for Mac OS X) starts to do the coding within it. For example, I can type in {Browse 'Hello World'} and execute Oz -> Feed Buffer to get the result in Tcl/Tk browser. Then, how can I build or execute the Oz code in command line just like I do with Python or Ruby? I found binaries in the bin directory. /Applications/Mozart2
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