Questions tagged [array]
The array tag has no usage guidance.
48
questions
0
votes
0
answers
9
views
How to use custom message arrays in a service response with Python?
I'm trying to populate a service response array in a Python coded service node and I'm getting an assertion violations from one of the IDL generated files.
The service Service.srv definition is the ...
0
votes
0
answers
158
views
How to plot array topics on RQT_plot?
I am working on a project where I need to plot data from ROS2 array topics using rqt_plot. The data I'm dealing with involves multiple array topics, which are published per cycle from another node. ...
- 1
0
votes
0
answers
62
views
ROS custom msg to be used in an ESP32 microcontroller using Platformio
I'm trying to publish an array of quaternions to a single topic on ROS noetic. For that I created a new message type following the tutorial:
...
0
votes
1
answer
380
views
Publishing array data with rqt
I'm trying to use the rqt message publisher to publish a message of type std_msgs/msg/Float64MultiArray.
I can't figure out how I'm supposed to give the ...
kvik
0
votes
1
answer
10
views
how does one index array in rospy?
I need the size of a custom array msg type. (The type is geometry_msgs/PoseStamped[] PoseStampedArray.)
I need to iterate on the msg if it is not empty and I would very much like to get the last ...
gbohus
0
votes
1
answer
11
views
how can i save rostopic in array?
Hi guys. I need help.
I want to make nodes that 'subscribe topic - save in array' and 'read array - publish topic'.
(in my case it is geometry_msgs::Pointstamped)
But there are no references and ...
Ray_Shim
0
votes
1
answer
72
views
How to get length of array of geometry_msg:Points in service handle?
I'm trying to find the length of an array of geometry_msg:Point passed to a service handle, so I can iterate over each Point, apply a transform and then push onto a response. when I use sizeof(req....
LukeAI
0
votes
1
answer
26
views
looping through a custom message in ROS Kinetic
I created a custom message and it has string array(can be called a list)
As I need to iterate through the string array, there is no built in dir that helps with it.
Whenever I try to run a for loop on ...
mustafa404
0
votes
1
answer
625
views
How can we actually use Float32MultiArray to publish 2D array using Python?
Hi,
I am frustrated trying to understand the concept of Float32MultiArray. I have been reading the documentations from Float32MultiArray API , MultiArrayLayout and MultiArrayDimesion but I still don't ...
dual-swordsman
0
votes
1
answer
5
views
Length of the tracks array in radar_msgs/RadarTrackArray
Hi,
I'm having this programming problem in ROS.
I'm looping through the tracks array in radar_msgs/RadarTrackArray message and accessing its values. I'm using for-loop:
...
roskinetic
0
votes
1
answer
3
views
[crystal] Is there a limit on the array.resize?
When I try to resize a embedded array only 128 values are printed.
After the 128 values, a '...'] is shown.
This is when using ros2 topic echo.
Is this to be ...
Obeseturtle
0
votes
1
answer
46
views
How to send Array Message from Arduino to ROS Topic?
Hi Buddy,
I'm newbie in ROS and i trying to send data from arduino to Ros Topic. I have send string and integer type. But in Array type i have a small problem. This is my source code:
...
ToanJunifer
0
votes
1
answer
1
view
Subscriber to array type overwriting data from different publishers!
Hi,
I have been witnessing some bizarre behaviour with my very simple node.
I have a custom message that contains uint8[] type (it's 8 elements long). I have a ...
Hypomania
0
votes
1
answer
85
views
Subscribing to a Float32MultiArray and printing each value
Hey everyone, I'm trying to do exactly what the title says , subcribe to a Multi Array with Float32 values (7 elements), and print each value for testing purposes.
For some reason, what worked with ...
th6262
0
votes
1
answer
8
views
subscribe field of message array
Hey there,
I would like to subscribe a field of a message array.
E.g. if my message looks like this:
BallStates.msg:
BallState[] ball_states
BallState.msg:
...
Markus
0
votes
1
answer
4
views
0
votes
1
answer
169
views
Publish and subscribe array of vector as message
Hi all,
I am trying to send an array of vector from one node to another node as a message. The message contains this array and other message fields as well.
My cpp file has the following array vector:
...
rosusernli
0
votes
1
answer
37
views
Float64[9] covariance array in C++
I am trying to fill in an IMU message, and it requires 3 arrays of Float64's.
How can I fill such an array in C++, initializing the first element with value -1 and the other values 0.
The ...
Chrizzl
0
votes
2
answers
84
views
How would I publish a 2D float Array through a ROS message?
I am currently working on a circle detection app. Using OpenCV, I get a std::vector<std::vector<float>> named ...
sharan100
0
votes
1
answer
75
views
How to publish an array of strings?
operation=['addition','subtraction','multiplication','division']
I want to publish each element in the array from one node and subscribe those elements by other node. What should be the proper python ...
mhharshal
0
votes
1
answer
13
views
Return array in service in c++
Hi people!
I'm starting with ROS and I have a problem implementing a client and server. I used the files created in the tutorials of ROS but I would like to return an array of strings and I don't know ...
javietos
0
votes
1
answer
24
views
How to publish a 2 dimensional array of known values
Hello,
I'm stuck at my program to publish a 2 dimensional array. The array kinda looks like this:
int deptharray[4][5] = {
{0, 0, 0, 0},
{0, average11, average21, average31, average41},
{0, average12, ...
beeeeck
0
votes
1
answer
6
views
2D array as service response
I want to use a service that has a 2D array response
this is my .srv file
uint32 a
---
uint32[][] tree
catkin_make error:
...
Moon
0
votes
1
answer
168
views
Assign C++ Array to ROS Msg Array
How do I assign a C++ array to a ROS message array? In particular, how do I do this for a float64[9] array?
Originally posted by atp on ROS Answers with karma: 529 on 2016-04-22
Post score: 1
atp
0
votes
1
answer
121
views
rostopic echo of a field of an array in ROS Indigo
Hi,
I have an issue trying to display a field of an array in a message in ROS Indigo with the command rostopic echo.
I'm trying to display the position of an object detected with the Ork package, ...
Cyril Jourdan
0
votes
1
answer
44
views
Publishing and Subscribing Vectors
Hi,
How can I receive a vector (with unknown length and contains three floats) over Publisher and Subscriber in C++?
Originally posted by hsoltani on ROS Answers with karma: 70 on 2015-08-02
Post ...
hsoltani
0
votes
2
answers
6
views
publish array velocities in a topic?
Hi Ros users!
I have just done a .cpp wich publish velocities in a opic (p3dx/cmd_vel)
Here it is:
...
Alvaro Salcedo
0
votes
1
answer
71
views
Append data to vector3[] array - custom message
Hey guys out there,
with lovely help of ROSanswers I got into creating and defining custom messages.
My aim is to create a custom message which contains of an array of vector3(). I basically got a ...
Holzroller
0
votes
1
answer
8
views
Syntax for extracting string array from srv response in C++
I'm trying to call a service and get a response from my ROS package. The specific srv is gazebo_msgs/GetWorldProperties, which is as follows:
...
Jordan9
0
votes
1
answer
15
views
Array as response in service
I'm trying to create a service that returns an array of a custom msg. However, when I call this using roservice call /myservice [input params...] I get the following error:
ERROR: service [/...
genericsoup
0
votes
1
answer
22
views
Push_back doesn't work
hi everyone,
i'm writing a node that could save 3 coordinate and then add a point to a pointcloud.
i'm trying to use pushback for the array of points in the cloud, this is the code:
...
JacoPisa
0
votes
1
answer
3
views
rqt_plot for data in DignosticArray message
I have been trying (unsuccessfully) to plot /diagnostics/status[0]/values[0]/value (a stringified floating point number).
Is such a topic string supported by rostopic or rqt_plot ? If so, how do I ...
john.novak
0
votes
1
answer
16
views
Error creating array type custom message for ros service in python
Hey,
I m trying to create a script that sends a service message to the server. Everything is good on the server side but I'm trying to build the client side using Python, just to get familiar with ...
Vijeth
0
votes
1
answer
9
views
How to publish a array msgs with large data size in Arduino?
Dear all, I amtrying to publish a msgs with large data size on Arduino. I have tried both Float32MultiArray and Laserscan msgs. However, when i increase the data_length more than 7, it shows an error ...
bisimai111
0
votes
1
answer
1
view
Storing kinect depth data from turtlebot in an array
I'm trying to write a ros node that subscribes to the turtlebot kinect data streams and can retrieve a distance at a specific point in the image (for starters, it will just be the centre centre point) ...
Alkaros
0
votes
1
answer
4
views
Extract data from Image.msg
I need to process the data from a webcam (i used USB_CAM Package).
Initially I created a listener that from the topic "/usb_cam/image_raw" extrapolates the array uint8 [] data ... but ...
...
MarcoTe6
0
votes
1
answer
179
views
custom message for matrix or 2d array
Hi! I need to publish a matrix as a ROS message and I was looking around for common types of messages to see how 2d arrays were used. I checked on the following links
http://ros.org/wiki/std_msgs
http:...
fersarr
0
votes
1
answer
1
view
return an array from a function member of a class
I'm using ROS and OpenCV in C++ environment in order to acquire a video (gray-scale) from a ROS node, convert the data through cv_bridge (in order to elaborate it through OpenCV), extract some data ...
mateo_7_7
0
votes
1
answer
95
views
How to rosservice call with arrays
I'm using ROS electric.
I have an srv that contains 2 arrays of int32[]
rosmake functions correctly and the service is listed.
However when I try to call the service I cannot get it to accept the ...
DocSmiley
0
votes
1
answer
3
views
Visualizing a point cloud previously stored in an array
Hello,
I'd like to visualize a point cloud by using rviz. The points' coordinates were previously stored in an array that contains the x-, y- and z-coordinates of each point within a struct data type. ...
tordalk
0
votes
1
answer
7
views
Capturing Kinect Audio
Is it possible to access the audio stream from Kinect's microphone array within ROS? I found a brief reference in the deprecated kinect stack but nothing else. A quick Google search indicates that ...
georgebrindeiro
0
votes
1
answer
1
view
ROS Answers SE migration: publish array
hi at all,
easy question (or at least i hope so): how can I write a publisher which publishes an float64array? the problem is, i'm quite new to c++ so i don't understand all of the lines in the ...
shane
0
votes
3
answers
178
views
How to initialize a UInt8MultiArray message
Not too much info on these (or any of the variants) on the wiki: what is the proper way to initialize these? I've tried:
...
ipso
0
votes
1
answer
42
views
How to receive and array of floats over a user defined message type?
Example message type :
Request :
//request feature's 308 variables!
float64[308] features
Response :
//response Contains object type!
int64 object_type
After compiling with success all of this and ...
ZsurzsaLaszlo
0
votes
1
answer
2
views
How do I numpy-ize a Service node or a Client node to manage Request or Response containing numpy array?
Hi,
I am trying to transmit a numpy array in a response of a service but I have some trouble to convert it in the appropriate type. I saw the numpy_msg tutorials it works fine for messages but I don't ...
sylou
0
votes
2
answers
13
views
publish an array of images
Hi,
I am trying to publish an array of images. Looking at ros wiki I couldn't find something relevant... I am attaching below my code... The publishing of the array should be at the "try" ...
Yianni
0
votes
1
answer
2
views
How to set the dimensions of the initial pose array
The initial pose array is really much bigger than it needs to be. How do I change it's initial dimensions?
Originally posted by JediHamster on ROS Answers with karma: 995 on 2011-04-16
Post score: 1
...
JediHamster
0
votes
1
answer
14
views
How to recieve an array over Publisher and Subscriber? (Python)
Examples would be useful.
Originally posted by GeniusGeeko on ROS Answers with karma: 299 on 2011-03-17
Post score: 8
GeniusGeeko