notation

How can I convert between scientific and decimal notation in Perl?

由 我们两清 提交于 2019-12-01 16:38:28
问题 I know this is a total newbie question, but the answer may not be obvious to many new programmers. It wasn't initially obvious to me so I scoured the Internet looking for Perl modules to do this simple task. 回答1: sprintf does the trick use strict; use warnings; my $decimal_notation = 10 / 3; my $scientific_notation = sprintf("%e", $decimal_notation); print "Decimal ($decimal_notation) to scientific ($scientific_notation)\n\n"; $scientific_notation = "1.23456789e+001"; $decimal_notation =

In Java, when is the {a,b,c,…} array shorthand inappropriate, and why?

由 江枫思渺然 提交于 2019-12-01 15:18:07
问题 If you're defining a variable, it appears to be perfectly valid to declare/define a variable as follows: double[][] output = {{0,0},{1,0}}; But if you're returning a value, it appears to be invalid to write the following: public double[] foo(){ return {0,1,2} } I would have thought that internally, both of these would have been performing the same action. Eclipse, at least, disagrees. Does anyone know what the difference is, and where else it can be seen, or why it would be beneficial to

Show that g(n) is O(g(n)) for each of the following [closed]

由 烈酒焚心 提交于 2019-12-01 13:09:12
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed last year . 2^(sqrt(log(n)) is O(n(^4/3)) n^(4/3) is O(n(log(n))^3) n(log(n))^3) is O(n^(log(n)) n^(log(n)) is O(2^n) I can do it for them when they have the same base; I can't figure it out when they don't have the same base--I know that these are all true. 回答1: Take log on both sides, for

Named query on a Mapped Superclass

由 旧时模样 提交于 2019-12-01 13:02:44
I'm trying to declare a NamedQuery on a mapped superclass, but I obtain this error: org.hibernate.hql.ast.QuerySyntaxException: VoipCall is not mapped [select v from VoipCall v where v.audioFile = :audioFile] We use hibernate, but we prefer to use JPA standard notation. Here is the code: @MappedSuperclass @NamedQueries(value = { @NamedQuery(name = "getVoipCallsForAudio", query = "select v from VoipCall v where v.audioFile = :audioFile") }) public abstract class VoipCall implements Serializable { It seems that I cannot use my mappedSuperClass in the query, but I don't understand why if in the

Calling function inside object using bracket notation

由 …衆ロ難τιáo~ 提交于 2019-12-01 08:04:28
If i have a function defined inside some object as in : var myobject={ myfunction:function(){//mycode here} } usually you can access the function using: myobject.myfunction() but what if i want to use myobject["myfunction"] trying so , actually the function did not get called , how can i call the function using brackets notation ? Use it like. You were very close myobject["myfunction"](); You can also do this var myfuncname="myfunction"; myobject[myfuncname](); The two forms myobject.myfunction; and myobject["myfunction"]; are equivalent as long as you only use a fixed string to access the

Big O Notation with Absolute Value?

由 十年热恋 提交于 2019-12-01 06:50:43
I'm going through some programming interview question books, and I've seen reference to "O(|A|)" time complexity. I've never seen this notation with the absolute value given. Some research led me to Big O Cheatsheet that references this notation under the graphs section. The problem I'm researching is about partitioning an array, which isn't really a graph question (though I risk perhaps showing my ignorance with that statement). Does |A| refer to the magnitude of the array, or otherwise number of elements, i.e. O(N) ? In set theory notation |A| is the cardinality of set A , in other words the

Big O Notation with Absolute Value?

由 北慕城南 提交于 2019-12-01 04:35:22
问题 I'm going through some programming interview question books, and I've seen reference to "O(|A|)" time complexity. I've never seen this notation with the absolute value given. Some research led me to Big O Cheatsheet that references this notation under the graphs section. The problem I'm researching is about partitioning an array, which isn't really a graph question (though I risk perhaps showing my ignorance with that statement). Does |A| refer to the magnitude of the array, or otherwise

Binary Numbers and Representation of Bases

由 核能气质少年 提交于 2019-12-01 01:32:35
问题 So, binary is just base 2, right? 1s and 0s. But why, when you convert from dec to bin, on Google for example, does it also have an (x)b in front of the actual number? What does the, for example, 0b __ mean? 回答1: The notation 0b in front of a number is just an indicator that what follows is represented in binary. That way, if you see something like 1001, you know it's the number "one thousand one" rather than nine written out in binary. More generally, the prefix 0b usually means "binary,"

convert scientific notation to decimal in bash

由 ぃ、小莉子 提交于 2019-11-30 20:37:04
I would like to convert a number that is stored in scientific notation into a floating point decimal, so I can then perform some comparisons on the data. This is being done in a bash script - here is a small snippet of the code: while read track_id landfall_num gate_id pres_inter do if [[ $landfall_num == 0001 ]] then start_flag = true echo DING DING $start_flag if [[ $pres_inter < 97000 ]] then echo Strong Storm From North $track_id, $gate_id, $pres_inter fi fi done < $file My problem is that my < operand is selecting basically all of the pressure values, which are stored in scientific

Syntax Error with `<` in Coq Notations

由 我们两清 提交于 2019-11-30 17:27:11
问题 The following code: Reserved Notation "g || t |- x < y" (at level 10). Inductive SubtypeOf : GammaEnv -> ThetaEnv -> UnsafeType -> UnsafeType -> Set := | SubRefl : forall (gamma : GammaEnv) (theta : ThetaEnv) (u : UnsafeType) , gamma || theta |- u < u where "g || t |- x < y" := (SubtypeOf g t x y). gives the following error: Syntax error: '<' expected after [constr:operconstr level 200] (in [constr:operconstr]) I get a similar error if I use <: in place of < . But this code works fine:
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