In App Designer: put new data into a (ui)table

Question

Gavin 2024-7-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2140651-in-app-designer-put-new-data-into-a-ui-table

编辑： Adam Danz 2024-8-9

This should be easy... Data comes in from a serial device consisting of a character and a number (time in msec) and I want to insert it into a table on screen.

I've got my serial callback working (after much effort) and I thought the next step would be easier. I have created a uitable that is displayed on the screen. Empty at first, called ResultsTable and thus referred to as app.ResultsTable with 2 columns named 'Event' and 'Time'. Everything else about the table is defaulted.

The app.ResultsTable.Data is initially [ ] as expected and as each bit of info comes in I want to add it to the table. Serial callback parsed the input into PType (a character) and PTime (uint32) so why does

app.ResultsTable.Data(app.NextTrial,'Event') = char(PType);
app.ResultsTable.Data(app.NextTrial,'Time') = PData;

Give me multiple columns where the number of columns is the ascii value of the character? If PType is 'A' I get 64 zeros and then a 65. I've tried various combinations of [ PType PData ] ( etc.) { another attempt }. All kinds of complicated merging of multiple tables is described in help but not simply putting new data into a new table within App Designer code (which has to be different than MatLab of course)

And after I get that first row in, I sure hope I can keep adding rows (app.NextTrial is the row index of course) for as long as I have enough memory (maybe 1000 rows?), that I can later export to an excel file or .CSV.

Thanks for the help for an old time C coder new to Matlab.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Gavin 2024-7-28

I finally hit on something that works. Wouldn't hurt to document simple example like this inTable halp.

app.ResultsTable.Data(end+1,:) = [PType,PData];

remaining problem is that even though PType is a char the table shows a number

app.ResultsTable.Data = setvartype(app.ResultsTable.Data, {'Event','Time'},{'char','uint32'});

or

app.ResultsTable = setvartype(app.ResultsTable,{'Event','Time'},{'char','uint32'})

Gives Incorrect number or types of inputs or outputs for function setvartype.

Example in Help

opts = setvartype(opts,{'LastName','Gender','Location',...

'Smoker','SelfAssessedHealthStatus'},'string');

So I tried

app.ResultsTable.ColumnFormat {'char','uint32'}

Index in position 1 exceeds array bounds.

I thought I was on the right track since

app.ResultsTable.ColumnName

ans =

2×1 cell array

{'Event'}

{'Time' }

and

K>> app.ResultsTable.ColumnFormat

ans =

0×0 empty cell array

More help searching on cell array... try

K>> C = {'char', 'uint32'}

C =

1×2 cell array

{'char'} {'uint32'}

K>> app.ResultsTable.ColumnFormat = C

Error setting property 'ColumnFormat' of class 'Table':

ColumnFormat definitions must be either 'numeric', 'logical', 'char', 'short', 'long', 'short e',

'long e', 'short g', 'long g', 'short eng', 'long eng', 'bank', '+', 'rat' or be a popupmenu

definition

OK so no uint32 allowed, now you tell me!

K>> C = {'char', 'long'}

app.ResultsTable.ColumnFormat = C

ans =

1×2 cell array

{'char'} {'long'}

So obvious (NOT!) why didn't I think of that first. At least no error but then again it doesn't work

76 63383

76 64298

76 65535

82 65535

How long is long? where is my char?

Mario Malic 2024-7-28

在 MATLAB Online 中打开

app.ResultsTable.Data(end+1,:) = [PType,PData];

This is one of the first thing you learn, when you learn MATLAB. It wouldn't hurt if you went over MATLAB Onramp quickly, takes 30-60 mins IIRC.

Gavin 2024-7-29

i thought I'd go ahead and do the course but I got this:

Course Overview >Course Overview

HTTP ERROR 431 Request Header Fields Too Large

URI:/R2024a/videoPage.html?caption=on&lang=en&videoIdUrl=6084985398001&isLocalized=false&volume=1&play=false&darkMode=falseSTATUS:431MESSAGE:Request Header Fields Too Large

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mario Malic 2024-7-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2140651-in-app-designer-put-new-data-into-a-ui-table#answer_1491351

在 MATLAB Online 中打开

Hi Gavin,

Hopefully, I understood the question and here's an example code that could help.

hFig = uifigure();
t = uitable("Parent", hFig);
pType = 'a';
pData = 1;
pType = convertCharsToStrings(pType); % uitable supports string arrays, not char arrays
for i = 1 : 5
    if isempty(t.Data) % Init (sets the var types too)
        t.Data = [pType, pData];
    else
        t.Data(end + 1, :) = [pType, pData]; % adding data to the next row
    end
    pData = pData + 1;
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Gavin 2024-7-29

Thank you, that took care of it. The isempty() part is necessary or it puts the first one in as NAN. If one isn't changing types it's not necessary.

I come from the world of C, C++ and other strongly typed languages. MatLab's weak typing causes more troubles than is solves IMO.

请先登录，再进行评论。

In App Designer: put new data into a (ui)table

4 个评论
显示 2更早的评论隐藏 2更早的评论

采纳的回答

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

In App Designer: put new data into a (ui)table

4 个评论 显示 2更早的评论隐藏 2更早的评论

采纳的回答

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

更多回答（0 个）

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

4 个评论
显示 2更早的评论隐藏 2更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论