How to open a file of unknown type?

16 次查看（过去 30 天）
Goncalo Costa
Goncalo Costa 2021-10-9
评论： Star Strider 2021-10-9
I am trying to open a file "pulse" of type "file", on my MATLAB, with the purpose of plotting a 2D graph. The type of the file is unknown to me, but when I write:
type pulse
I get a set of random characters as a result. How can I find the type of file, and plot it, as I know this to be a file with data for a 2D plot.

请先登录，再回答此问题。

回答（1 个）

Star Strider
Star Strider 2021-10-9
The ‘random characters’ likely mean that it is a binary file. If so, use fread to read it, although unless more is known about the file format, reading it may be a process of trial-and-error until it is imported correctly.
It could also be Unicode, and that would also require some experimentation, possibly with the unicode2native function.
.
  2 个评论
Goncalo Costa
Goncalo Costa 2021-10-9
When I do as you wrote I get:
"Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters."
I believe this file was a ".m" file but was encripted or modified to be emailed to me. I just want to plot the data in its original form, but somehow the file is not presented as data, but as random symbols.
Thank you so much for your help.
Star Strider
Star Strider 2021-10-9
That’s important information. If it is (or originally was) an .m file, it’s likely in pcode.
See How to decrypt a pcode to understand that it will likely not be possible to convert it back to something readable. If the documentation for it is available, run it using that information.
Good luck with it!
.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by