The Output structure of a code is showing different outputs in command window and workspace

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Manikanta Aditya 2024-7-13

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编辑： Manikanta Aditya 2024-7-16

When working on a program, after executing it and checking output in MATLAB command window and in output from workspace is giving different outputs. Which is correct output here and what is this happening?

Command window output:

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Manikanta Aditya 2024-7-15

Yes, struct shows all fields, disp is not.

Manikanta Aditya 2024-7-16

Thank you @dpb, @John D'Errico, @Walter Roberson everyone for your help!

I understood the issue here, whatever the file output is, the command window output is the correct and respective output. In workspace output struct, it was displaying all the outputs irrespective of any format, so I understood this is expected, hence this clarifies my query, Thanks again!

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Walter Roberson 2024-7-13

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The command window version is the result of an implicit execution of the display method. The display method examines the object details and displays whichever parts of it that it believes to be important, in whatever order it feels are important.

The workspace output examines the result of executing struct on the object. Hidden properties are exposed. Internal order is used.

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Manikanta Aditya 2024-7-13

@Walter Roberson, Thanks for the details.

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dpb 2024-7-13

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As @John D'Errico says, they're both correct only the workspace browser has unfolded the various struct content that is only displayed as the struct, not the content of the struct in command window. So, there's more to the struct than is just displayed at the command window, but it would be very annoying if the command window expanded everything...

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dpb 2024-7-13

编辑：dpb 2024-7-13

We cannot do anything but look at the image you posted; the workspace viewer expanded what is in the returned object. All we can do is say those are there if the browser says they are.

What is returned will be totally dependent upon what the content of what was read is and how it was read -- if the reader is returning ng data, it must be in the file regardless the extension that was used for the file.

There are "magic" bytes used at the beginning of the file to allow the reader code to determine whether a file is a pcap or a pcapng file. The difference between the two is the pcap file has only a single 4-byte code while a ng version has a different initial 4-byte code plus a 4-byte length followed by a second 4-byte code.

Specifically, the values are

pcap: D4C3B2A1 or A1B2C3D4 (depends on byte order)

pcapng: 0A0D0D0A + (4 bytes length) + 4D3C2B1A or 1A2B3C4D (depends on byte order)

So, the reader first scans the file header content to distinguish and then adapts to what the content of the file shows, not presuming from the extension of the file name.

NOTA BENE: If the reader were to use the file extension only, then the read operation would fail because the actual file format would not match that expected given the differences between the two types.

Again, attach the file and the reader object and your (minimal) code...images aren't of any use.

Manikanta Aditya 2024-7-13

@dpb, I am still working on the code, but thanks for the help!

Manikanta Aditya 2024-7-13

This is not possible for sure, the format files are different as they are meant to be.

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