Exercise in "Data Processing and Visualization" not working?

Hello MATLAB Community,

I didn't know where to ask this question, so I went here.

I have a problem with a section of the self-paced course in "Data Processing and Visualization" in MATLAB. It's section 5.7 (2/5) Task 2. I did write everything down as I should to merge the tables, which are specified. My output does show the required result, however, MATLAB continuously tells me, that it is incorrect.

I would have used the "solutions" by now, but it does not work either. The "table editor" is just grey and stuck on the solution for Task 1.

I cannot detect anything wrong with my input, but I do need to complete this course in order to proceed. I hope you can help me with that.

Thanks in advance

Answer 1

[Cris LaPierre]

Thanks for pointing this out. I've shared it internally. You can use the "See Solution" link to see what settings were expected. Use those in your task to submit and move on.

[Leo S]

The issue is, that I can't see the "solution". It is just a grey version of the "table editor" and I can't even interact with it. Nor does it show the solution.

[Cris LaPierre]

Ah ok. I got confused since it shows up somewhat grayed out and I also can't interact with it, but I can see it. Here's a screenshot.The solution shows up all the way to the right.

[Leo S]

Ok, it worked, but what is the point of this excercise now? The regular "join" function doesn't even contain all the information of the tables T1 and T3.

The task is very missleading! I thought you should retain all the information from the original tables (obviously)

[Cris LaPierre]

Look at the images associated with each type of Join opperation. The outer circle represents the raw data, the inner blue circle represents the resulting table. Only an Outer Join will keep all the data from both tables. Join will only keep the variables that are common to both tables.

See if the description here helps. You could also find more about the Join Tables task you are using here.

[Leo S]

Yes but this was not the point.

The "solution" to the task was to press "join", even though it's useful or not. In this case it was not useful, so I did not use this particular operation. And the task description didn't even include, that I was supposed to press "join" under any circumstances. It just said "join the tables", not "use the "join" operation" or whatever.

To me, "join the tables" did not include, that I should only use the "join" function. It sort of implied to me, that the appropriate join operation would work for this task. And that was not "join".

[Cris LaPierre]

I believe I've answered your original question, as you're now able to proceed with the course. If you would like to submit a bug report, such as an improvement to the course, you can do so here.