How do you add values to an array, but keep the previous values

Question

Mason 2023-11-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2046755-how-do-you-add-values-to-an-array-but-keep-the-previous-values

编辑： Cris LaPierre 2023-11-14

Im attempting to make a function that essentially just displays a 10-digit number to later sort that array through other values and verify the number exists in my file.

CT is a counter, It counts how many times a button was pressed, the value changes so that the next button "pressed" is placed into the column to the right of the previous number. T is the value of the number I want to input (This value is 0-9 depending on the button pressed). While this works, the previous values become 0 and the array is just a 1x10 of zeros with only the new value.

How might I fix this so that LN displays a 10 digit number using all my new values instead of just the most recent one.

function LN = NumberBook(CT,T)
if CT == 1 % Start of counter
    LN = zeros(1,10); % Allocated space | 10 Digit restriction (Implimented later on)
    
end
LN(0+CT) = T; % Adds number to array
disp(LN) % Displays updated number
end

I essentially want it act like this per inputted value;

ans =
     9     3     4     0     1     4     0     2     0     0
     
ans =
     9     3     4     0     1     4     0     2     5     0
     
ans =
     9     3     4     0     1     4     0     2     5     2

Instead of;

ans =
     0     0     0     0     1     0     0     0     0     0
     
ans =
     0     0     0     0     0     4     0     0     0     0
     
ans =
     0     0     0     0     0     0     0     0     0     0

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Answer 1

Cris LaPierre 2023-11-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2046755-how-do-you-add-values-to-an-array-but-keep-the-previous-values#answer_1351740

Is there more to your code? Keep in mind variable scope. Because you are inside a function, there are no previous values of LN.

Your solution of indexing into LN to make the assignment is the solution. However, you must provide an array with the previous values to your function.

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Mason 2023-11-13

在 MATLAB Online 中打开

This is the function that Numberbook is called(I had to call numberbook as Numberbook(CT,T) without LN since LN doesnt exist outside numberbook if I use the function @Voss gave);

%% Output of each number
    function y = Out(Num) % Calls Num to be used as a variable...
        % Sets all Num characters to numerical values
            % Does this all live
    y = 0;
  if strncmp(Num(1), '1', 1)
        y = 1;
        T = 1;
  elseif strncmp(Num(1), '2', 1)
        y = 2;
        T = 2;
  elseif strncmp(Num(1), '3', 1)
        y = 3;
        T = 3;
  elseif strncmp(Num(1), '4', 1)
        y = 4;
        T = 4;
  elseif strncmp(Num(1), '5', 1)
        y = 5;
        T = 5;
  elseif strncmp(Num(1), '6', 1)
        y = 6;
        T = 6;
  elseif strncmp(Num(1), '7', 1)
        y = 7;
        T = 7;
  elseif strncmp(Num(1), '8', 1)
        y = 8;
        T = 8;
  elseif strncmp(Num(1), '9', 1)
        y = 9;
        T = 9;
  elseif strncmp(Num(1), '*', 1)
        y = 10;
        T = 10;
  elseif strncmp(Num(1), '0', 1)
        y = 11;
        T = 0;
  elseif strncmp(Num(1), '#', 1)
        y = 12;   
        T = 11;
  end
cnt = 1; % Keeps counter on
CT = Press(cnt); % Registers if button was pressed
set(groot,'defaultFigureVisible','off')
    close(figure, 2)
Tone_Data(y); % Sets tone for each output
        NumberBook(CT,T); % Number Book
        
    end

The function Voss gave me;

function LN = NumberBook(CT,T,LN) % <- pass LN to the function
if nargin < 3 || CT == 1 % Start of counter
    LN = zeros(1,10); % Allocated space | 10 Digit restriction (Implimented later on)
end
LN(CT) = T; % Adds number to array
disp(LN) % Displays updated number
end

Cris LaPierre 2023-11-13

编辑：Cris LaPierre 2023-11-14

I shared links to both doc pages. Each contains examples of how to use that approach to save values. Note that one approach is for figure-based apps, and one is for uifigure-based apps.

From your screenshot below, you have an edit box in your gui. Why not store the numbers there? Then you don't need to worry about saving it to the figure or displaying it in the command prompt. The app is where your user will see the number.

Mason 2023-11-13