How to remove quotation marks from each element of my array

Question

Will Pihir 2021-9-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1444394-how-to-remove-quotation-marks-from-each-element-of-my-array

评论： Will Pihir 2021-9-1

采纳的回答： Chunru

在 MATLAB Online 中打开

Hi Guys,

I have made a 10x10 gameboard with the first row and column containing the numbers from 0 to 9.

When I display the gameboard, each element has quotation marks around it which I would like to remove. Note that the gameboard isn't correctly displayed when using ' ' instead of " ".

Any help is much appreciated.

%Initialising array and parameters
gameboard = [];
rows = 10;
cols = 10;
 
%Populating with nested loop
for r = [1:rows]
    gameboardRow = [];
    for c = [1:cols]
        hypens = "-";
        gameboardRow = [gameboardRow hypens];
    end
    gameboard = [gameboard; gameboardRow];
end
 
gameboard(1,:) = [0:9];
gameboard(:, 1) = [0:9];
 
disp(gameboard);
    "0"    "1"    "2"    "3"    "4"    "5"    "6"    "7"    "8"    "9"
    "1"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "2"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "3"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "4"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "5"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "6"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "7"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "8"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"
    "9"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"    "-"

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Stephen23 2021-9-1

在 MATLAB Online 中打开

for r = [1:rows]
%       ^      ^ superflouus, get rid of them.

https://www.mathworks.com/matlabcentral/answers/35676-why-not-use-square-brackets

Most of your code consists of inefficient nested loops that simply generate a string matrix of the hyphen character: expanding arrays inside loops should be avoided. Rather than using nested loops simply use much simpler REPMAT:

nrows = 5;
ncols = 5;
M = repmat("-",nrows,ncols)
M = 5×5 string array
    "-"    "-"    "-"    "-"    "-"
    "-"    "-"    "-"    "-"    "-"
    "-"    "-"    "-"    "-"    "-"
    "-"    "-"    "-"    "-"    "-"
    "-"    "-"    "-"    "-"    "-"

Assuming that you require the matrix to be string type, then most likely the answer to your question is to write your own display routine using FPRINTF. Doing so will give you much more control over how it looks when displayed.

Will Pihir 2021-9-1

I've been instructed by my teacher to use a nested loop.

Thanks for the help

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Answer 1

Chunru 2021-9-1

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1444394-how-to-remove-quotation-marks-from-each-element-of-my-array#answer_778339

在 MATLAB Online 中打开

gameboard = [];
rows = 10;
cols = 10;
 
%Populating with nested loop
gameboard = repmat('-', 10, 10);
gameboard(1, :) = ('0':'9');
gameboard(:, 1) = ('0':'9');
 
disp(gameboard);
0123456789
1---------
2---------
3---------
4---------
5---------
6---------
7---------
8---------
9---------
% Place space along rows
gameboard = repmat('- ', 10, 10);
gameboard(1, 1:2:end) = ('0':'9');
gameboard(:, 1) = ('0':'9');
disp(gameboard);
0 1 2 3 4 5 6 7 8 9 
1 - - - - - - - - - 
2 - - - - - - - - - 
3 - - - - - - - - - 
4 - - - - - - - - - 
5 - - - - - - - - - 
6 - - - - - - - - - 
7 - - - - - - - - - 
8 - - - - - - - - - 
9 - - - - - - - - - 