Josh,

I found out what the problem is. But I do not have a solution to it right now.

#include <ros/ros.h>
#include <QtGui>

int main(int argc, char** argv)
{
    QApplication app( argc, argv, false );

    ros::init(argc, argv, "params_test");

    ros::NodeHandle n;

    double a = 1.5;
    n.setParam( "a", a );

    double a_get;
    n.getParam( "a", a_get );

    ROS_INFO_STREAM( "a=" << a << " a_get=" << a_get );

    return 0;
}

Gives me
[ INFO] [1288340780.906072159]: a=1.5 a_get=1

Without QApplication it gives me
[ INFO] [1288340754.462816012]: a=1.5 a_get=1.5

So the problem is QApplication. I am using Ubuntu 9.04 with QT 4.5.0. I will now upgrade to Qt 4.6 hoping that this changes something.

Regards
Christian

Do you have a small test-case that fails that I could try? We have a test-case for exactly this:

  double double_param = 0.0;

  EXPECT_TRUE( param::get( "double", double_param ) );

  EXPECT_DOUBLE_EQ( double_param, 10.5 );

Does the params test in test_roscpp also fail?

Josh

On Thu, Oct 28, 2010 at 5:09 AM, Christian Verbeek <verbeek@servicerobotics.eu> wrote:

getParam(const std::string &key, double &d)

returns only the integer part of the parameter.

ros::NodeHandle nh( "~" );
double dvalue;
nh.getParam( "key", dvalue );

dvalue=0 // in the launch file 0.2
dvalue=1 // in the launch file 1.5
...

in /opt/ros/cturtle/ros/core/roscpp/src/libros/param.cpp
I printed the XmlRpcValue and this gives me

<value><double>0</double></value>
<value><double>1</double></value>

Whats going wrong? Any ideas?

rosparam get key
returns 0.200000000000000001 or 1.5

so the values in the parameter server are correct.

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