how to insert fprintf value into GUI edit text box?

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Phoebe 2021-4-18

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评论： Phoebe 2021-4-23

Hi there! I'm having issues on inserting my fprintf value into the GUI's edit text box...I think the error is at where I marked below but I can't seem to solve it. If you try to remove those two lines of code and just leave there as "fprintf('%s', morse{index});" , you will see my desire output at the command window...

In this case, you will see something similar as mentioned above but the difference is there'll be a random number showing in the GUI's edit text box...can someone help ? thanks!

    morseoutput=fprintf('%s', morse{index}); %(I think here's the error)
    set(handles.morsecode_output,'string',morseoutput) ;  

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Stephen23 2021-4-19

"...there'll be a random number showing in the GUI's edit text box"

Not random: the fprintf documentation states that it returns the number of bytes printed to the command window or file.

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Stephen23 2021-4-18

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编辑：Stephen23 2021-4-18

You need to use sprintf, not fprintf:

sprintf creates a character vector/string (this is what you need).
fprintf prints directly to a file or the command window.

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Stephen23 2021-4-19

编辑：Stephen23 2021-4-19

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The basic problem is that on every loop iteration you replace the results of the previous iteration, in the end leaving you with only the data from the final loop iteration. You could solve this problem by accumulating the required data in one array within the loop, and then calling SET with that data after the loop, something like this:

n = numel(engmsg);
c = cell(1,n);
for k = 1:n
  [~,x] = ismember(engmsg(k), letter);
  if x
    c(k) = morse(x);
  end
end
set(handles.morsecode_output,'string',[c{:}]);

However a much better use of MATLAB is to avoid the loop entirely:

msg = 'Hello';
morse  = {'-----','.----','..---','...--','....-','.....','-....','--...','---..','----.','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
letter = ['0':'9','A':'Z','_'];
[X,Y] = ismember(upper(msg),letter);
str = sprintf(' %s',morse{Y(X)})
str = ' .... . .-.. .-.. ---'

Printing to the command window using fprintf is not a solution.

Walter Roberson 2021-4-19

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handles.engmsg_input = uicontrol('style', 'text', 'Position', [0 0 100 100]);
engmsg = ' .... . .-.. .-.. ---'
morsemsg = strsplit(engmsg, ' ');
morsemsg(cellfun(@isempty, morsemsg)) = []
morse  = {'-----','.----','..---','...--','....-','.....','-....','--...','---..','----.','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
letter = ['0':'9','A':'Z','_'];
[X,Y] = ismember(morsemsg,morse);
engoutput = letter(Y(X))
set(handles.engmsg_input,'string',engoutput);

works for me to show 'HELLO'

It should only be showing one output.

If you are wanting input of / to indicate start of a new line in output then you need to program that:

handles.engmsg_input = uicontrol('style', 'text', 'Position', [0 0 100 100], 'max', 2);
engmsg = ' .... . .-.. / .-.. ---'
morsemsg = strsplit(engmsg, ' ');
morsemsg(cellfun(@isempty, morsemsg)) = []
morse  = {'-----','.----','..---','...--','....-','.....','-....','--...','---..','----.','.-','-...','-.-.','-..','.','..-.','--.','....','..','.---','-.-','.-..','--','-.','---','.--.','--.-','.-.','...','-','..-','...-','.--','-..-','-.--','--..','/'}; 
letter = ['0':'9','A':'Z','_'];
[X,Y] = ismember(morsemsg,morse);
engoutput = strsplit( letter(Y(X)), '_')
set(handles.engmsg_input,'string',engoutput);

Walter Roberson 2021-4-19

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You have a single string of morse input that has spaces in it. The strsplit() breaks it up into pieces at the spaces.

In the case that you had extra spaces in the morse input, such as a space at the beginning or at the end, or two or more spaces in a row in the middle, then strsplit() will end up creating empty entries. For example,

...  --- ... 
   ^^   ^   ^

where the marked ^^ place has two spaces instead of one space and the string ends in a space. strsplit applied to that would not automatically be smart enough to know that you want {'...', '---', '...'} as your pieces, and will instead create {'...', '', '---', '...', ''} where the '' are empty character vectors.

The cellfun(@isempty, morsemsg) finds the empty entries (if any are there are all) returning a logical vector for each entry as to whether it is empty or not. Then the indexing of morsemsg by that logical vector selects the ones that are empty, and the assignment of [] deletes the entries. So afterwards, morsemsg will not have any of those '' entries that corresponded to unexpected spaces.

Stephen23 2021-4-23

编辑：Stephen23 2021-4-23

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"like this"

No. As Walter Roberson pointed out, by using ISMEMBER you have already compared the content of those two variables, so you do not really need to compare them again. You can simply use the outputs from ISMEMBER together with ALL, ANY, and NOT as required. Start by looking at the inputs and outputs of these: