gtsam prints pointers instead of values

asked 2021-02-25 09:01:50 -0600

Spyros
51 ●23 ●26 ●33

updated 2021-02-25 09:33:20 -0600

Hello. I'm trying to run some of the gtsam library examples in one of my nodes. When one of the print function is called (i.e. result.print("Final Result:\n");) instead of printing values as shown in the tutorial, it prints pointers.

Final Result:

Values with 5 values:
Value 1: (gtsam::Pose2)
0x558a39e0fef0

Value 2: (gtsam::Pose2)
0x558a39e0ff50

Value 3: (gtsam::Pose2)
0x558a39e0cf10

Value 4: (gtsam::Pose2)
0x558a39e0cf70

Value 5: (gtsam::Pose2)
0x558a39e0cfd0

What can be the problem here? I installed the library with the procedure described here. Is it useful to uninstall and reinstall the library? and if it is, how can I do it without messing up with my nodes that already use gtsam?

Any kind of feedback is appreciated. Thanks in advance.

I use Ubuntu 18, ROS melodic and I have C++ nodes.

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I'm sorry to have to do this for something so seemingly unimportant, but please don't post screenshots of terminal text in question on ROS Answers. It's all text, so there is no need. Just copy-paste the text from the terminal into your question text. Do make sure to format it properly by selecting the text and pressing ctrl+k (or clicking the Preformatted Text button (the one with 101010 on it)).

You don't need to post a new question, just edit your curent one. You can use the edit button/link for this.

After you replace the screenshot with the error message itself, we can re-open your question.

gvdhoorn ( 2021-02-25 09:23:29 -0600 )edit

@gvdhoorn it requires more than 200 points to reopen a question

Spyros ( 2021-02-25 09:35:13 -0600 )edit

that's why I wrote:

we can re-open your question.

gvdhoorn ( 2021-02-25 09:44:33 -0600 )edit

Sorry, i didn't notice. Thanks.

Spyros ( 2021-02-25 11:30:40 -0600 )edit

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Final Result: Values with 5 values: Value 1: (gtsam::Pose2) (-3.62586e-13, -1.35991e-12, -5.28358e-13) Value 2: (gtsam::Pose2) (2, -3.02085e-12, -7.54546e-13) Value 3: (gtsam::Pose2) (4, -3.9288e-11, 1.5708) Value 4: (gtsam::Pose2) (4, 2, 3.14159) Value 5: (gtsam::Pose2) (2, 2, -1.5708)

Comments

Is there a way to send gtsam::Values object, in your case the variable result, as a ROS message between nodes? I looked at creating custom ROS messages but I am confused on how to do this with gtsam::Values object and gtsam::NonlinearFactorGraph objects.

hunterlineage1 ( 2023-07-21 11:20:03 -0600 )edit

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gtsam prints pointers instead of values

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