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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks. |
So for example it says: SensorChannel([channel_ID]):GetRawSum()
Do I need to add the [ and ] or do I just add the sensor channel between the () so does it look like ([sensor channel]) or (sensor channel)
This is where you should reference the code you already have. In this case:
sumGB = math.ceil((SensorChannel(1):GetRawSum()/1024/1024/1024))
Notably this part:
SensorChannel(1):GetRawSum()
As you can see, the brackets themselves are not used (this is a standard convention), but rather denote that a certain thing should be used.
Also this: invoice:AddItem([name], [value])
- Add an item to the <#itemtable> placeholder in the template.
There is no "<#itemtable> int he template. Would I just type in <#itemtable> at the bottom of the script?
Not 100% on this. Sounds like there's a default placeholder that's already made as part of the invoice, so all you have to is add items to it using AddItem([name], [value]) and they'll be handled internally. It's not explicitly listed in the documentation, but it's possibly the class given to the table that gets generated, e.g.
<table class="itemtable">
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On August 23 2011 05:22 TadH wrote:Show nested quote +On August 23 2011 05:19 UltimateHurl wrote:
How did I just see this thread? Did my undergrad in software engineering, about to learn lua in my spare time just because. You wanna give me a hand then? :D
Craton got to it before I could, but as he says anything in square brackets like that is probably just a placeholder for whatever you put there, so don't use the square brackets, they are like quotes in "put whatever you want here". If <#itemtable> isn't auto-generated you might need to add it yourself. Still working on learning Lua, hope that helps 
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again i would like to ask for tl's help here, im really new to haskell and i want to apply this function
crossproduct :: [a] -> [b] -> [(a,b)]
crossproduct (a:as) (b:bs) = (a,b) : crossproduct as bs
crossproduct _ _ = []
as i try to use that function, it says that my a and b are not in the scope. i realky think there is missing but i really dont know 
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With C# is there a way to dynamically NAME your arrays? Or perhaps a different solution all around? I tried looking it up, but most discussions are about what dynamic arrays are, which I understand. I essentially want to name this dynamic array by a dynamically created value.
The basic situation is I am reading in nodes from a WSDL. I want to find a way to store all the parent nodes that are read into parentNodeArrays (named according to the element name of the parentNode, which will be dynamically read in), and then the childNodeArrays likewise into different dynamic arrays for child nodes.
I know I cannot just do something like:
int arrayCounter = 0;
List<t>(parentNodeGroupName + arrayCounter) = new List<t>();
arrayCounter++;
Obviously that won't work. But I hope that gives a better idea of what I'm trying to accomplish? Other ideas I've considered have been using XDocument to create an XML file with a custom defined structure based on the information read in.
edit: http://stackoverflow.com/questions/5033675/how-do-i-name-variables-dynamically-in-c
Found this. Basically the same idea as what I wanted. Perhaps a keyed collection would do the trick...
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On August 25 2011 23:49 icystorage wrote:again i would like to ask for tl's help here, im really new to haskell and i want to apply this function crossproduct :: [a] -> [b] -> [(a,b)] crossproduct (a:as) (b:bs) = (a,b) : crossproduct as bs crossproduct _ _ = [] as i try to use that function, it says that my a and b are not in the scope. i realky think there is missing but i really dont know
dunno if that helps, but try the bracketing trick:
crossproduct (a:as) (b:bs) = ((a,b) : (crossproduct as bs))
also, juding from the name of your function, are you looking for something more along these lines?
crossproduct as bs = crossproductt as bs bs
crossprodcutt :: [a] -> [b] -> [b] -> [(a,b)]
crossproductt (a:as) (b:bs) bbs = (a,b) : crossproduct (a:as) bs bbs
crossproductt (a:as) _ bbs= crossproduct as bbs bbs
crossproductt _ _ _ = []
(could ofc be done nicer with predefined functions in the likes of map/fold/etc, but i really didn't code any haskell for too long, so i have no clue how the syntax would need to be there.
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United States1176 Posts
On August 26 2011 08:21 MisterD wrote:Show nested quote +On August 25 2011 23:49 icystorage wrote:again i would like to ask for tl's help here, im really new to haskell and i want to apply this function crossproduct :: [a] -> [b] -> [(a,b)] crossproduct (a:as) (b:bs) = (a,b) : crossproduct as bs crossproduct _ _ = [] as i try to use that function, it says that my a and b are not in the scope. i realky think there is missing but i really dont know dunno if that helps, but try the bracketing trick: crossproduct (a:as) (b:bs) = ((a,b) : (crossproduct as bs)) also, juding from the name of your function, are you looking for something more along these lines? crossproduct as bs = crossproductt as bs bs crossprodcutt :: [a] -> [b] -> [b] -> [(a,b)] crossproductt (a:as) (b:bs) bbs = (a,b) : crossproduct (a:as) bs bbs crossproductt (a:as) _ bbs= crossproduct as bbs bbs crossproductt _ _ _ = [] (could ofc be done nicer with predefined functions in the likes of map/fold/etc, but i really didn't code any haskell for too long, so i have no clue how the syntax would need to be there.
How are you using the function? Because the code compiles fine and ghci accepts uses of it readily:
crossprod :: [a] -> [b] -> [(a, b)]
crossprod (a:as) (b:bs) = (a,b) : crossprod as bs
crossprod _ _ = []
===
*Main> crossprod [1, 2, 3] [4, 5, 6]
[(1,4),(2,5),(3,6)]
And to try to clear your confusion up front, on the first line, a and b are type parameters to crossprod. On the second line, a and b are pattern variables that are bound to values. So on each line they have a different meaning (and indeed you can rename them to whatever you want to alleviate the confusion), but just like how a function parameter does not have meaning outside of the context it was declared, a and b do not have meaning outside of these two lines.
Also it sounds like that you're writing this for practice which is great, but it is worthwhile to point out that crossprod is really zip.
zip :: [a] -> [b] -> [(a, b)]
zip takes two lists and returns a list of corresponding pairs. If one input list is short, excess elements of the longer list are discarded.
Furthermore, what you wrote is precisely the implementation of zip (which is good!)
----------------------------------------------
-- | 'zip' takes two lists and returns a list of corresponding pairs.
-- If one input list is short, excess elements of the longer list are
-- discarded.
zip :: [a] -> [b] -> [(a,b)]
zip (a:as) (b:bs) = (a,b) : zip as bs
zip _ _ = []
Hoogle is your best friend and one of the many reasons why Haskell is a great language to use.
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I just spent the last 6+ hours thinking up some construct to extract the return type of arbitrary functions, even in the presence of functions with the same name. I finally succeeded, but the approach requires C++0x extensions, namely variadic templates and macros. I thought I'd share it.
using namespace std;
#define resultof(f, ...) typeof(Param<__VA_ARGS__>::Func(f))
template <class... Args>
class Param
{
public:
template <class R>
static R Func (R (*) (Args...));
template <class R, class C>
static R Func (R (C::*) (Args...));
};
int f ();
double f (int x);
int f (int x, int y);
int main (int argc, char* argv[])
{
resultof(f, int) d = 1.1;
cout << d << endl;
}
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Do any of you listen to music while coding? I have a Pandora subscription, so I usually have it on while I'm coding at work. I tend to listen to Pandora's "Black Dog" station, since they're one of my favorite ambient-electronic groups and other related groups are good too. I find it easy to concentrate with ambient music, and very difficult with rock/lyrical music. Any suggestions for bands/groups that won't be too distracting?
Sorry if this is too off-topic...
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On September 02 2011 10:34 EscPlan9 wrote:
Do any of you listen to music while coding? I have a Pandora subscription, so I usually have it on while I'm coding at work. I tend to listen to Pandora's "Black Dog" station, since they're one of my favorite ambient-electronic groups and other related groups are good too. I find it easy to concentrate with ambient music, and very difficult with rock/lyrical music. Any suggestions for bands/groups that won't be too distracting?
Sorry if this is too off-topic...
Shouldn't be that off-topic considering this comes up at work all the time. I recommend Kaskade's albums since they flow together along with Pretty Lights. Those two are usually pretty solid for just getting in the zone while coding.
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I like several genres of music, but ambient and related calm, slow genres are good for coding. They make everything crystal clear and easy to focus. Repetitive, sharp, strong music just dulls me and breaks my concentration.
My friend is the opposite, he can not stand ambient music, he seemingly has a hyperactive imagination and his mind wanders off the code and into a world induced by ambient music, filled with spaceships, oceans and flutes. He listens to Suicide Commando instead.
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I am never sure if its progaming or programming xD Anyone else?^^
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Time for a noobish question. Can you use the same object over multiple c++ files?
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EscPlan9, I dont understand your post at all. First off, if you have a WSDL, cant you generate a webservice proxy and use strongly typed object. If that approach doesnt work out and sounds like your getting XML, do you have the XSD for the XML. That way, you can serialize and deserialize the XML into a object. If you dont want to do it that way, can't you use LINQ to XML to and create a annonoymous object with the name for the property you would want.
Maybe, an example of what your trying to do and I can be more clear on taking the best approach.
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Can i get a small tutorial on how to link .dat files and mp3 files to a python executable?
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NerdOpinionShow, I will try to answer your question but I also haven't used C++ in ages. You only have one entry point into your code which should be in main function.
For Example, you can have multiple files with dependencies like such:
FILE 1:
public class A
{
public A()
{
}
}
FILE 2:
public class B
{
Public B(A a)
{
}
}
FILE 3
public Program
{
int Main() // <- Entry point
{
A a = new A();
B b = new B(a); // <- this in example takes the same object over multiple files
}
}
Please forgive my C++ syntax. But that should be the general gist of C++
If that doesn't help, I probably did not understand your question correctly.
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On September 03 2011 08:58 NerdOpinionShow wrote:
Time for a noobish question. Can you use the same object over multiple c++ files?
If you compile separately then link, you need to declare it as extern I believe, and initialize in a single cpp file. Never actually done it, I always declare and initialize them in header files and compile & link in one pass. I am pretty sure it would cause complications like double objects if I were to compile separately.
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On September 03 2011 08:58 NerdOpinionShow wrote:
Time for a noobish question. Can you use the same object over multiple c++ files?
Sure, that's what globals do. You have some header:
global.h
#ifndef GLOBAL_H
#define GLOBAL_H
#include "MyObject.h"
extern MyObject global_object;
#endif
and a cpp file:
global.cpp
#include "global.h"
MyObject global_object;
now global_object is accessible from every file that includes global.h
But generally globals are an indicator of questionable design. Instead of having a global access point for a object that lots of other objects need access to, it is usually better to "inject" that object into the others with pointers.
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> Working on a reference / pointer wrapper class in C++0x that proxies most of its operators to the contained class
> For 4+ days
> Encountering the third compiler bug / unimplemented feature that nullifies the current implementation
> Would need GCC 4.7+ to implement it properly
> Requires me to redesign my wrapper
> mfw
![[image loading]](http://i.imgur.com/mbiyP.jpg)
Here's the abomination for show
One question though, should I interpret
ref<T> x = new T(...);
ref<T> y = new T(...);
x += y;
As x = ref<T>(x.get() += y.get()); or
x = ref<T>(x.get() + y.get()); ?
The former modifies the pointed object as well, the latter modifies only the reference wrapper. I am not sure how Java does it, are compound assignment operators applicable only to primitives?
In fact, should I convert results of all operators to ref<U> where U is the normal return type of the operator? For example in the case of double Test::operator + (int), ref<Test> would have a ref<double> ref<Test>::operator + (int) function. Or should I leave it as it is, double ref<Test>::operator (int)?
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Hyrule19031 Posts
It would be the second, as you cannot use assignment on a getter (unless it's designed horribly).
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I am the noobiest of the noobs when it comes to coding since I just began but...
In visual Dataflex (Language 4GL) How do I save information from the array so that the text file displays something like this:
Student information Example1 | Address Example | Money Example
Student information Example2 | Address Example | Money Example
Student information Example3 | Address Example | Money Example
Student information Example4 | Address Example | Money Example
Pretty much saying my GUI has three inputs and I want to give a line for each new information(Student info, address example, Money example) The three sections needs the columns for each info.
In addition how would I display a new information on the bottom of all the information on the .txt file? This only takes one line. (For example, total amount of students entered)
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EPT
