Transform double to char with one or two decimal places

Question

Alberto Acri 2023-9-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2019596-transform-double-to-char-with-one-or-two-decimal-places

评论： Walter Roberson 2023-9-11

I have a series of numbers:

n_A = 3.15;
n_B = 3.7;

I have to transform them into char considering 1 or 2 decimal digits based on the starting number, i.e. like this:

n_A = 3.15;    
A = sprintf('%.2f',n_A);
n_B = 3.7;    
B = sprintf('%.1f',n_B);

My question is how can I apply this:

sprintf('%.2f',#);

or this:

sprintf('%.1f',#);

knowing that the number has one or two digits after the decimal point?

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Answer 1

Stephen23 2023-9-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2019596-transform-double-to-char-with-one-or-two-decimal-places#answer_1307336

编辑：Stephen23 2023-9-11

在 MATLAB Online 中打开

You could use another format, e.g.:

fprintf('%.3g\n',[3.15,3.7])
3.15
3.7

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Alberto Acri 2023-9-11

Thanks for your answer @Stephen23. The one above is an example.

If I have a number (double) in input (n_A or n_B for example) I want in output a char number that has one or two decimal digits based on the input number.

So,

if N = 3.15 this becomes '3.15' (char)
if N = 3.70 this becomes '3.7' (char).

Walter Roberson 2023-9-11

在 MATLAB Online 中打开

n_A = 3.15;
fprintf('%g\n', n_A);
3.15
n_B = 3.70;
fprintf('%g\n', n_B)
3.7
format long g
n_A
n_A = 
                      3.15
n_B
n_B = 
                       3.7