rostopic pub multiarray

asked 2014-08-05 18:21:22 -0600

Quick question, how do I publish a multiarray? I use rostopic a lot, and its tremendously helpful. One thing I was never able to figure out, was how publish a multiarray(I also wasn't able to find a post on it).

This is the format it provides:

rostopic pub /topic_name std_msgs/Float32MultiArray "layout:
  dim:
  - label: ''
    size: 0
    stride: 0
  data_offset: 0
data:
- 0"

That can publish a single element multiarray, but I couldn't figure out how to add another element on that array.

I've tried...

rostopic pub /topic_name std_msgs/Float32MultiArray "layout:
  dim:
  - label: ''
    size: 0
    stride: 0
  data_offset: 0
data:
- [0.0, 1.0]"

and a bunch of other variants, but nothing works. If someone can help with the syntax, that would be appreciated!

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answered 2014-08-06 00:07:15 -0600

BennyRe
2949 ●16 ●30 ●54

See this answer:

$ rostopic pub /topic_name std_msgs/Float32MultiArray "layout:
dim:
  - label: ''
    size: 0
    stride: 0
  data_offset: 0
data: [0.0, 1.0, 2.0]"

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Thank you!

pwong ( 2014-08-07 11:19:14 -0600 )edit

1

Hello, I tried this a Int16MultiArray message and got this error out:

ERROR: No field name [dim]

Args are: [layout.dim layout.data_offset data]

Any idea what it could be?

atomoclast ( 2016-09-13 19:14:05 -0600 )edit

@atomoclast: Your message is malformed. You need to put dim inside the layout key, like this answer shows. e.g. {layout: {dim: [...]}, ...}, not {dim: [...]}.

Cerin ( 2017-03-26 11:03:13 -0600 )edit

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answered 2017-01-18 14:03:49 -0600

duck-development

1999 ●4 ●160 ●25

updated 2017-01-18 14:05:20 -0600

@atomoclast

i have an Messege Generated with works

 rostopic pub /speed std_msgs/Int16MultiArray "layout:
   dim: []
   data_offset: 0
 data: [10, 100]"

the Importen part ist the make an multi line CMD, and not convert the input to an single line

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YAML strings can be mulit-line or single-line. http://wiki.ros.org/YAML%20Overview

jayess ( 2017-03-26 12:12:08 -0600 )edit

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answered 2017-09-05 05:43:24 -0600

matEhickey
15 ●2 ●4 ●5

For me none of this worked, I always have an error like
"field data[] must be an integer type" (or a float if it's a float array of course.).

How I achieved to send multiple value was to set one value a a line preceding by a hyphen.

exemple:

rostopic pub /modbus_wrapper/input std_msgs/Int32MultiArray "layout:
  dim:
  - label: ''
    size: 2
    stride: 0
  data_offset: 0
data:
- 0 
- 1
- 3
"

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