如何从八度列表中安装很多软件包？

Question

I would want to install a few packages in an automated way and i was trying do this using a simple for loop. As shown below.

   pkgs = '../pkgs';
   names = dir(fullfile(pkgs, '*.tar.gz')); 
   n = numel(nomes);
   for i = 1:n
        pkg install names(n).name
   end

This is first attempt that returns to me this 8 times

warning: file names(n).name does not exist

And i'm looking for a way to get the ans value of names.name.

Answer 1

Instead of all that code, you can use 'glob()' to get the list of tarballs, and then a single pkg() call to install all of them. Like so:

fpaths = glob ("pkgs/*.tar.gz");
pkg ("install", fpaths{:});

Answer 2

MATLAB and Octave both allow the easy syntax of

functionname arg1 arg2 ...

by translating it to the proper function call

functionname('arg1','arg2',...);

This implies that in order to pass the value of variables as arguments (rather than the variable names themselves), you must use the functional form:

pkgs = '../pkgs';
names = dir(fullfile(pkgs, '*.tar.gz')); 
n = numel(names);                    %// fixed your typo here
for k = 1:n
     pkg('install',names(k).name)    %// changed here, also n -> i -> k
end

Note that you had two typos: names was written as nomes in line 3 (translation issue, probably), and more importantly, you were using n rather than i in the loop. As a matter of fact, don't use i as a variable in Octave: that stands for the imaginary unit, and can lead to subtle errors if you're uncautious. I changed to k in the above code.