The little knowledge that MATLAB uses:
Ctrl+r: Add multiple lines of comment
Ctrl+t: For the reversal of the Ctrl+r
CLC: Represents the Clear Command window, which clears the current Command Window window, which is clear screen clear all: Clears all loaded data
Ctrl+i: Automatic typesetting
Partition matrix: New_matrix=matrix (Start_line:end_line,start_row:end_row)
Matrix Merge: Column column merge: matrix=[matrix1;matrix2]; line-and-line merge: Matrix=[matrix1,matrix2] or matrix=[matrix1 matrix2]
Instances of the class:
ClassDef Tensiledata
Properties
Material = ' carbon steel ';
Samplenumber = 0;
Stress
Strain
End
Properties (Dependent)
Modulus
End
Methods
function td = Tensiledata (Material,samplenum,stress,strain)
If Nargin > 0
Td. Material = Material;
Td. Samplenumber = Samplenum;
Td. Stress = Stress;
Td. Strain = strain;
End
End% Tensiledata
End
Methods
function obj = set. Material (obj,material)
If ~ (Strcmpi (material, ' aluminum ') | | ...
Strcmpi (material, ' stainless steel ') | | ...
Strcmpi (material, ' carbon steel '))
Error (' Material must be aluminum, stainless steel, or carbon steel ')
End
Obj. Material = Material;
End% Material Set function
function modulus = get. Modulus (obj)
IND = Find (obj. Strain > 0); % Find Nonzero strain
modulus = mean (obj. Stress (Ind)./obj. Strain (Ind));
End% modulus Get function
function obj = set. Modulus (obj,~)
fprintf ('%s%d\n ', ' modulus is: ', obj. Modulus)
Error (' You cannot set modulus explicitly ');
End
Function disp (TD)
fprintf (1, ' Material:%s\nsample number:%g\nmodulus:%1.5g\n ',...
Td. Material,td. Samplenumber,td. modulus);
End% disp
function plot (td,varargin)
Plot (TD. Strain,td. stress,varargin{:})
Title ([' Stress/strain Plot for Sample ', NUM2STR (TD. Samplenumber)])
Xlabel (' Strain% ')
Ylabel (' Stress (PSI) ')
End% plot
End
Methods (Access = ' private ')% access by class members only
function M = Calcmodulus (TD)
% over-simplified calculation of Elastic modulus
IND = FIND (TD. Strain > 0); % Find Nonzero strain
m = Mean (TD. Stress (Ind)./td. Strain (Ind));
End% Calcmodulus
End
End% ClassDef
In the above code,
ClassDef Tensiledata
...
End
is to define a Tensiledata class. Code:
Properties
Material = ' carbon steel ';
Samplenumber = 0;
Stress
Strain
End
Is the attribute that defines the class, which is the member variable of the class in C + +. However, unlike C + +, the class definition in MATLAB has a more special place, that is, to define the dependency property, such as the following code:
Properties (Dependent)
Modulus
End
This means that the Modulus property is a dependency property, and its value is computed from other properties, where the default property value of dependent is true.
Its value is implemented by the following function:
% modulus Get function
function modulus = get. Modulus (obj)
IND = Find (obj. Strain > 0); % Find Nonzero strain
modulus = mean (obj. Stress (Ind)./obj. Strain (Ind));
End
The definition of a method (function) of a class occurs in the form of methods. End. As defined by the following class method:
Methods
function td = Tensiledata (Material,samplenum,stress,strain)
If Nargin > 0
Td. Material = Material;
Td. Samplenumber = Samplenum;
Td. Stress = Stress;
Td. Strain = strain;
End
End
End
The function block defines the Tensiledata constructor method. The last method in the preceding code is methods (Access = ' private ')
Access = ' private ' means that the method can only be accessed and modified by the class itself and is a private member method. Where properties access can also be divided into
Setaccess and Getaccess, the property values are the same as access.
A "..." appears in the DISP function statement to indicate that the next line and the current row are joined together. Such as:
Function disp (TD)
fprintf (1, ' Material:%s\nsample number:%g\nmodulus:%1.5g\n ',...
Td. Material,td. Samplenumber,td. modulus);
End
It means that the second and third rows are joined together.
Write a small piece of the log in a MATLAB program
