Display data from an online file

Question

Daimien Burks 2012-5-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/37116-display-data-from-an-online-file

Hi, I'm trying to have text appear on the screen that displays the information found in this online document, but I only get the first two to display correctly. The message that appears says this:

DATE: 11100107-LOC-1804-COORDS-N-MAGTYPE

and I would like it to say:

DATE: 11100107-LOC-1804-COORDS-N28E62-MAGTYPE-B

Because this is the first line of the file: 11100107 1804 N28E62 B

Code:

block = urlread('ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_REGIONS/USAF_MWL/2010/USAF.10');
readData = textscan(block, '%d %d %c %6c', 'delimiter', char(' '));
date = readData{1};
loc = readData{2};
coords = readData{3};
type = readData{4};
formatSpec = 'DATE-%d-LOC-%d-COORDS-%c-MAGTYPE-%c';
hPopSunspots = uicontrol(hPanelAni,'Style','text','Units','normalized','FontSize',14,...
        'Position',[1.72 -0.55 2.60 0.12],'String',sprintf(formatSpec,date,loc,coords));
clear readData

I would like to be able to display the next row for each new object but I'll settle for one. Any ideas? Thanks a lot!

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Answer 1

per isakson 2012-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/37116-display-data-from-an-online-file#answer_46366

在 MATLAB Online 中打开

It is easier to handle the first four columns as text. readData is cell array of cell arrays. Delimiter takes care of the spaces. "%*[^\n]" takes care of "rest of line".

    readData = textscan(block, '%s%s%s%s%*[^\n]', 'delimiter', char(' '));
    ....
    formatSpec = 'DATE-%s-LOC-%s-COORDS-%s-MAGTYPE-%s';
    ....
    .....   sprintf(formatSpec,date{:},loc{:},coords{:})

--- EDIT ---

Make changes in the indexing of the following lines. That will give you column vectors containing data from all rows.

    date = readData{:,1};
    loc = readData{:,2};
    coords = readData{:,3};

You need to learn how to use the debugger and inspect variables in debug mode. (Matlab shows the "K>>" prompt in the command window.) There are good videos on debugging in the Matlab help.