MATLAB指令窗操作入门学习笔记

2023-07-12 14:08| 来源: 网络整理| 查看: 265

1、简单计算器的使用 %1、简单计算机的使用 a=(55+5*(7.5-0.5))/2^3 %2、简单数组的输入 A=[1 2;3 4;5 6] %3、数组分行输入 B=[1,2 3,4 5,6] a = 11.2500 A = 1 2 3 4 5 6 B = 1 2 3 4 5 6 2、MATLAB中的预定义变量

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3、工作空间与变量管理

通常用以下三个指令进行变量管理： 1、clear指令删除变量 2、who查看工作空间的变量名 3、whos了解变量的具体信息

clear >> X1=[0.2,1.11,3]; Y1=[1,2,3;4,5,6]; m=77; n=0.5; >> who 您的变量为: X1 Y1 m n >> whos Name Size Bytes Class Attributes X1 1x3 24 double Y1 2x3 48 double m 1x1 8 double n 1x1 8 double 4、常用的数字显示格式指令

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a=215/3 >> format short e;a a = 7.1667e+01 >> format long e;a a = 7.166666666666667e+01 >> format short g;a a = 71.667 >> format long g;a a = 71.6666666666667 >> format hex;a a = 4051eaaaaaaaaaab >> format bank;a a = 71.67 >> format +;a a = + >> format rat;a a = 215/3 5、常见的操作键

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6、MATLAB常见的标点符号功能

需要注意的是：输入指令时，一般要在英文状态下输入。请添加图片描述

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7、在线帮助的使用

常用的两种在线帮助指令 1、help 2、lookfor

help format format Set output format. format with no inputs sets the output format to the default appropriate for the class of the variable. For float variables, the default is format SHORT. format does not affect how MATLAB computations are done. Computations on float variables, namely single or double, are done in appropriate floating point precision, no matter how those variables are displayed. Computations on integer variables are done natively in integer. Integer variables are always displayed to the appropriate number of digits for the class, for example, 3 digits to display the INT8 range -128:127. format SHORT and LONG do not affect the display of integer variables. format may be used to switch between different output display formats of all float variables as follows: format SHORT Scaled fixed point format with 5 digits. format LONG Scaled fixed point format with 15 digits for double and 7 digits for single. format SHORTE Floating point format with 5 digits. format LONGE Floating point format with 15 digits for double and 7 digits for single. format SHORTG Best of fixed or floating point format with 5 digits. format LONGG Best of fixed or floating point format with 15 digits for double and 7 digits for single. format SHORTENG Engineering format that has at least 5 digits and a power that is a multiple of three format LONGENG Engineering format that has exactly 16 significant digits and a power that is a multiple of three. format may be used to switch between different output display formats of all numeric variables as follows: format HEX Hexadecimal format. format + The symbols +, - and blank are printed for positive, negative and zero elements. Imaginary parts are ignored. format BANK Fixed format for dollars and cents. format RAT Approximation by ratio of small integers. Numbers with a large numerator or large denominator are replaced by *. format may be used to affect the spacing in the display of all variables as follows: format COMPACT Suppresses extra line-feeds. format LOOSE Puts the extra line-feeds back in. Example: format short, pi, single(pi) displays both double and single pi with 5 digits as 3.1416 while format long, pi, single(pi) displays pi as 3.141592653589793 and single(pi) as 3.1415927. format, intmax('uint64'), realmax shows these values as 18446744073709551615 and 1.7977e+308 while format hex, intmax('uint64'), realmax shows them as ffffffffffffffff and 7fefffffffffffff respectively. The HEX display corresponds to the internal representation of the value and is not the same as the hexadecimal notation in the C programming language. See also disp, display, isnumeric, isfloat, isinteger. format 的参考页

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