How can we control the number of decimal places when outputting in MATLAB?

2 years ago
William Carter
1 minute

In MATLAB, you can use formatting strings to control the decimal places in output. Here are some commonly used methods:

  1. write in a formatted way
  2. format a string
x = 3.1415926;
fprintf('%.2f\n', x);  % 输出2位小数
  1. Convert number to string
x = 3.1415926;
str = num2str(x, '%.2f');  % 转换为2位小数的字符串
disp(str);  % 输出字符串
  1. structure
format short;  % 默认格式，输出4位小数
x = 3.1415926;
disp(x);  % 输出4位小数
  1. layout
format long;  % 输出更多位小数
x = 3.1415926;
disp(x);  % 输出更多位小数

It is important to note that the methods mentioned above only control the display precision of the output, and do not alter the accuracy of the variables themselves. If you need to perform numerical calculations or save precise data, do not rely on output formatting control, but instead use appropriate numerical types and arithmetic functions.

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