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Paulo Silva
Last activity 2023 年 8 月 14 日

What is missing from MATLAB?

I'm curious, is there something you wish to do with MATLAB but you can't, maybe something you can do with other similar software but can't with MATLAB?

For new entries, please use the follow-up thread here. Please do not post new answers in this thread.

470

Tips & Tricks

amit jain
Last activity 2023 年 6 月 2 日

How to learn MATLAB

What is the best way to learn MATLAB at home without a tutor?

General

Oleg Komarov
Last activity 2023 年 6 月 7 日

Contributors metainfo: reputation and more

As asked by Vieniava in "How to make a list of user's reputation?", some of us came up with interesting ideas on how to fill an updated list with the reputation scores of the contributors to Answers.

I took the initiative to compile a public list of users with meta info:

position (desc ordering by reputation)
id
nickname (truncated to fit the page)
reputation
# of comments
# of questions asked
% accept rate
# of posts answered
# of accepted answers

The code used to compile the list is available at the bottom.

EDIT

TMW team implemented a page with the metascores: http://www.mathworks.com/matlabcentral/answers/contributors

Please refer to it and congrats to the team!

Use this function to retrieve info from the link above:

function [metainfo, elapsedTime] = metainfo(type,order)
% METAINFO - Retrieve metainfo on contributors to www.matworks.com/.../answers
%
%   METAINFO Retrieve data sorted by reputation in descending order 
%
%   METAINFO(TYPE,ORDER) Specify TYPE and sorting ORDER as
%       type :  'reputation'
%               'questions'
%               'answered'
%               'accepted'
%
%       order:  'asc'
%               'desc'
%   
% Examples:
%
%     % Standard call (rep, disc)
%     info = metainfo;
%       
%     % Sort by question answered in descending order
%     info = metainfo('an','d');
%
% See also: URLREAD, REGEXP
% Author: Oleg Komarov (oleg.komarov@hotmail.it) 
% Tested on R14SP3 (7.1) and on R2009b. In-between compatibility is assumed. 
% 28 feb 2011 - Created
tic
% Check # inputs
error(nargchk(0,2,nargin))
% Retrieve inputs
if nargin == 0
    type  = 'reputation';
    order = 'desc';
end
if ~exist(type,'var')
    sortTypes = {'reputation','questions','answered','accepted'};
    type  = sortTypes{strncmp(type,sortTypes,numel(type))};
    order = 'desc';
end        
if ~exist(order,'var')
    orderTypes = {'asc','desc'};
    type  = orderTypes{strncmp(order,orderTypes,numel(order))};
end        
% Build url string
url = ['http://www.mathworks.com/matlabcentral/answers/contributors?'...
       'dir=' order '&sort=' type '&page='];
% First read
[page, ok] = urlread([url '1']);
% Catch number of pages to read
if ok
    totcon = regexp(page,'>1 - 50 of (\d+)','tokens');
    totcon = dataread('string',totcon{1}{1},'%d');
    nPages = ceil(totcon/50);
else
    error('Cannot read ".../contributors?page=1"')
end
% Loop over contributors pages
metainfo = cell(totcon,7);
metainfo(1:end,1) = num2cell(1:size(metainfo,1));
for p = 1:nPages
    if ok
        endpos = 50*p;
        % Id, Rep
        expr = '><a href="\/matlabcentral\/answers\/contributors\/(\d+)';
        data = regexp(page, expr,'tokens');
        if 50*p > totcon; endpos = 50*(p-1)+numel(data); end
        metainfo(1+(p-1)*50:endpos,2) = [data{:}];
        % Nickname
        expr = ['"Reputation: (\d+)">([\w\ ' reshape([repmat(92,1,137);33:59,61:64,91:97,123:126,161:255],1,[]) ']+)</a></h2>'];
        data = regexp(page, expr,'tokens');
        metainfo(1+(p-1)*50:endpos,[4,3]) =  cat(1,data{:});
        % Qcount, Ans, Acc
        data = regexp(page, '<span >(\d+)</span>[A-z<>"-\s\/]+','tokens');
        metainfo(1+(p-1)*50:endpos,5:7) = reshape(cat(1,data{:}),3,[]).';
    else
        error('Metainfo import stopped. \nCannot read ".../contributors?page=%d"',p)
    end
    [page, ok] = urlread([url sprintf('%d',p+1)]);
end
% Convert to doubles
metainfo(:,[2,4:7]) = cellfun(@str2double,metainfo(:,[2,4:7]),'un',false);
elapsedTime = toc;

643

Ideas

Walter Roberson
Last activity 2023 年 2 月 12 日

[DISCONTINUED] Wish-list for MATLAB Answer sections.

This topic (which was not started by Mathworks) is for features you would like to see for this MATLAB Answers facility.

I suggest one wish per answer, so that people can vote for individual wishes.

What should you post where?

Wishlist threads (#1 #2 #3 #4 #5 #6): bugs and feature requests for Matlab Answers

Frustation threads (#1 #2): frustations about usage and capabilities of Matlab itself

Missing feature threads (#1 #2): features that you whish Matlab would have had

Next Gen threads (#1): features that would break compatibility with previous versions, but would be nice to have

@anyone posting a new thread when the last one gets too large (about 50 answers seems a reasonable limit per thread), please update this list in all last threads. (if you don't have editing privileges, just post a comment asking someone to do the edit)

578

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