How to write a script to analyse data files

2020 6 16
1 个回答
回答已采纳
更新时间：2020 6 18
8 次查看（30 天）

0 个投票

Hi I have a major issue,
I try to write a script wich just needs the name of a file in a specific Directory (in my case xxx.neu files from a GPS System) and just shows me a graph.
In general I do this in command Window:
load ana1CleanUnf.neu
plot (ana1CleanUnf)
This is very easy. My first intention to write a script to automate this was:
function x = getGPSstats('*.neu')
x = load '*.neu'
x = plot ('*.neu')
end
but this gives my an error:
Error: File: getGPSstats.m Line: 1 Column: 26
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets
instead of parentheses.
Well I really don't know how to fix this, I try so long but really don't get it.

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Niklas Reinshagen
Niklas Reinshagen 2020-6-16
I forgot to mention, that I got about 10 .neu Files. And want to save the script in the folder, so I can just plot them with one line of code.

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

Rik
Rik 2020-6-16

0 个投票

You can use dir to retrieve all the file names. And since you don't actually use the input of your function, I don't see why you would keep that.
I would also suggest writing a bit more robust code to load your data. This way the data magically appears in your workspace and it is difficult to track where each variable is coming from.

8 个评论
显示 6更早的评论 隐藏 6更早的评论

Niklas Reinshagen
Niklas Reinshagen 2020-6-16
Well I'm a bloody beginner, and this is a task from my teacher. He told the class, that we have to solve it by ourselfes.It is required to write a script, that accepts one .neu file name and directly plot it. The script should be as easy as possible.
I really don't understand why I can get a plot in the command Window, but not when i write it as a script or a function. Do you have any idea how to fix the problem? I don't find any online lectures to help me with this problem. What should be the call for an unspecific file to become load and plotted as in my Command Windows? Do you have any suggestions?
Best Regards
Image Analyst
Image Analyst 2020-6-16
I'd call uigetfile() to ask the user for the filename. I'd give you a snippet but since it's homework and you said "we have to solve it by ourselfes" I'll let you do it. It's very simple. And you have to pass your "x" data (actual numbers) into plot(), not a character string (filename).
Niklas Reinshagen
Niklas Reinshagen 2020-6-16
thats a good hint, but unfortunatly not that was is required. The script should only call a plot... Noting else. The script called: getGPSstats(ana1CleanUnf.neu) shoul'd call the Data, load it from the file into Matlab and plot it.
There should be nothing else. And our teacher told us, if we don't understand the way, we should ask the community so that everyone, who has the same problem, can get a solution.
Niklas Reinshagen
Niklas Reinshagen 2020-6-16
I've tried to do it a bit different but also don't get it right:
function x = getGPSstats('name')
% The first command is to navigate
% to the directory with the files
cd ~/Desktop/UNI/Matlab/Ex4_Data
%now load the requested file 'name.neu'
x = load ('name')
% and finally plot it
plot ('name')
end
But this gives me also an error
Rik
Rik 2020-6-16
A bit of a guess:
function x = getGPSstats(name)
% The first command is to navigate
% to the directory with the files
cd ~/Desktop/UNI/Matlab/Ex4_Data
%now load the requested file 'name.neu'
x = load (name)
% and finally plot it
plot (x)
end
The the line below should work (assuming load understands your data file and the file is in the hard-coded folder)
getGPSstats('ana1CleanUnf.neu')
Niklas Reinshagen
Niklas Reinshagen 2020-6-16
Man, you're great! Props to you! Thank you very much! Sometimes it's just a little bit of missunderstanding wich leads into total confusion. Not the script givs me the directly the Plot - that's great! But unfortunatly it also list up all the 4000 lines of the .neu file... even though I used the semicolon at the end of the lines. Do you know why?
Hope I don't look to stupid.
Rik
Rik 2020-6-17
getGPSstats('ana1CleanUnf.neu');
function x = getGPSstats(name)
% The first command is to navigate
% to the directory with the files
cd ~/Desktop/UNI/Matlab/Ex4_Data
%now load the requested file 'name.neu'
x = load (name);
% and finally plot it
plot (x)
end
Even like that?
Niklas Reinshagen
Niklas Reinshagen 2020-6-18
Thank you! It was the semikolon ath the End of the function to call it, now everything works fine!

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 File Operations 的更多信息

产品

版本

R2020a

标签

Community Treasure Hunt

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

Start Hunting!

Translated by