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  • Using functions and environments

    - by Eduardo Leoni
    Following the recent discussions here (e.g. 1, 2 ) I am now using environments in some of my code. My question is, how do I create functions that modify environments according to its arguments? For example: y <- new.env() with(y, x <- 1) f <- function(env,z) { with(env, x+z) } f(y,z=1) throws Error in eval(expr, envir, enclos) : object 'z' not found I am using environments to keep concurrently two sets of simulations apart (without refactoring my code, which I wrote for a single set of experiments).

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  • Accessing a database using visual c++ and OLEDB

    - by Shadi
    Does anybody have an example of working with database using Visual C++ and OLEDB? What should I include on top of my code? I have searched the internet and most examples are using C# or VB. Examples written by C++ are usually not complete. I really appreciate your help. Best, Shadi.

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  • Using java provided parameters into xpath function while applying xslt transformation

    - by filmac
    I'm working at a java application that performs some xslt transformation. I would like to match nodes into the xslt document, using a parameter provided by java. Which is the right way to do something like: <xsl:template match="//m:properties/*[contains($pattern,name())]"> because when I launch my application, it claims it's not able to compile the stylesheet, since pattern is not defined but I'm setting it using the setParameter method and I was able to use another parameter defined in the same way but in a different context. Thanks in advance Fil

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  • sending full form data to back end using jquery

    - by pradeep
    i have a form that is dynamically built. so the number of form elements arr not fixed. I wnat to send whole of $_POSt data from the form using jquery to back end for processing .i cant use jquery form plugin as the jquery version i am using is old. any other way ? i tied to do like this $.post('all_include_files/update_save.php',{variable:"<?php echo json_encode($_POST) ?>"},function(data) { alert(data); }) but did not work

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  • Read Windows event logs using Enterprise Library

    - by Sathish
    I am using Enterprise library 3.1 to log application logs in Windows event logs, and I want to read this log by passing the date parameter. Please note that I will be accessing the remote machine and the performance should be good. Is there any method that can be used to read these logs using Ent Lib, or please suggest some good method.

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  • C++ - Error: expected unqualified-id before ‘using’

    - by Francisco P.
    Hello, everyone. I am having some trouble on a project I'm working on. Here's the header file for the calor class: #ifndef _CALOR_ #define _CALOR_ #include "gradiente.h" using namespace std; class Calor : public Gradiente { public: Calor(); Calor(int a); ~Calor(); int getTemp(); int getMinTemp(); void setTemp(int a); void setMinTemp(int a); void mostraSensor(); }; #endif When I try to compile it: calor.h|6|error: expected unqualified-id before ‘using’| Why does this happen? I've been searching online and learned this error occurs mostly due to corrupted included files. Makes no sense to me, though. This class inherits from gradiente: #ifndef _GRADIENTE_ #define _GRADIENTE_ #include "sensor.h" using namespace std; class Gradiente : public Sensor { protected: int vActual, vMin; public: Gradiente(); ~Gradiente(); } #endif Which in turn inherits from sensor #ifndef _SENSOR_ #define _SENSOR_ #include <iostream> #include <fstream> #include <string> #include "definicoes.h" using namespace std; class Sensor { protected: int tipo; int IDsensor; bool estadoAlerta; bool estadoActivo; static int numSensores; public: Sensor(/*PARAMETROS*/); Sensor(ifstream &); ~Sensor(); int getIDsensor(); bool getEstadoAlerta(); bool getEstadoActivo(); void setEstadoAlerta(int a); void setEstadoActivo(int a); virtual void guardaSensor(ofstream &); virtual void mostraSensor(); // FUNÇÃO COMUM /* virtual int funcaoComum() = 0; virtual int funcaoComum(){return 0;};*/ }; #endif For completeness' sake, here's definicoes.h #ifndef _DEFINICOES_ #define _DEFINICOES_ const unsigned int SENSOR_MOVIMENTO = 0; const unsigned int SENSOR_SOM = 1; const unsigned int SENSOR_PRESSAO = 2; const unsigned int SENSOR_CALOR = 3; const unsigned int SENSOR_CONTACTO = 4; const unsigned int MIN_MOVIMENTO = 10; const unsigned int MIN_SOM = 10; const unsigned int MIN_PRESSAO = 10; const unsigned int MIN_CALOR = 35; #endif Any help'd be much appreciated. Thank you for your time. Thanks for your time!

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  • Does there exists a method to render an object using DebuggerDisplayAttribute

    - by Joe
    I have a number of classes that are decorated with DebuggerDisplayAttribute. I want to be able to add trace statements to Unit Tests that will display instances of these classes. Does there exist a method in the .NET Framework that will display an object formatted using DebuggerDisplayAttribute (or fall back to using .ToString() if no DebuggerDisplayAttribute is defined)?

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  • "Low level" project using Java

    - by Tammy Wilson
    I'm wondering if it would make sense to do some low level or OS stuff(a project) using Java. Reason why I ask is because I would like to expand my knowledge in Java and I'm into doing stuff like file compressor, bulk file renamer, etc. Are there any examples out there that I can look at or play with? Or should I just be using C or C++ instead? Thanks!

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  • fetch emails using curl php

    - by user331329
    How to fetch emails using curl php.. Hi i have been trying to fetch mails from an externalsite using curl but i am unable to login i have given the post data everything but does not know why i am not able to login........ Plz help me out.....

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  • Embedded linux call using system

    - by Gav
    I'm having a problem using system("command") call in C on an embedded system in linux. The call to the app works fine on the command line but when called in a compiled cgi script using the system command it is painfully slow. Any help appreciated?

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  • Importing images using subfloats in LaTeX

    - by melisma
    I am using subfloats to import 2 .png files in a figure to basically generate subfigures. There's no space between the figures when I compile it. How do I put some white space in between them? And is it possible to convert them to black and white using LaTeX?

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