How to show latex by override `disp` in classdef?

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jia
jia 2024-7-15
编辑： surya venu 2024-7-16
classdef Myclass
properties
R;
end
methods
function obj = PointGroupElement(R)
obj.R = R;
end
function disp(obj)
symMatrixStr = symmatrix('R(1/3,[0,0,1])');
disp(symMatrixStr);
end
end
end
When I run this class in live editor, I expect return or show latex form R(1/3,[0,0,1]) rather that str 'R(1/3,[0,0,1])', and i also know, it will return latex form when i run symMatrixStr = symmatrix('R(1/3,[0,0,1])') in live editor. So, what should i do to override disp so that the class outputs the latex form?

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回答（3 个）

Ayush Anand
Ayush Anand 2024-7-15
编辑：Ayush Anand 2024-7-15
I think there is a mistake in your class definition, as the class name and the constructor names are different in the snippet provided by you.
Fixing that gives me the result as expected; the returned form when the class is called from live script is latex itself, and not string:
classdef Myclass
properties
R;
end
methods
function obj = Myclass(R) %Fixing the constructor name
obj.R = R;
end
function disp(obj)
symMatrixStr = symmatrix('R(1/3,[0,0,1])');
disp(symMatrixStr);
end
end
end
  1 个评论
jia
jia 2024-7-15
Thanks for your answer, the name of class error is just a typo.
I want to obatin the result:
g = Myclass('R');
g % output R(1/3,[0,0,1])
rather that
g = Myclass('R');
disp(g) % output R(1/3,[0,0,1])

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surya venu
surya venu 2024-7-15
编辑：surya venu 2024-7-16
Hi,
To display the LaTeX form of a symbolic matrix when using the "disp" method in a class definition in MATLAB, you need to ensure that the symbolic matrix is properly created and displayed. And I see that there's mismatch of class name and constructor.
Here is an example MATLAB code:
classdef Myclass
properties
R;
end
methods
function obj = Myclass(R)
obj.R = R;
end
function disp(obj)
symMatrix = sym(obj.R);
% Convert the symbolic matrix to LaTeX format
latexStr = latex(symMatrix);
disp(['$$', latexStr, '$$']);
end
end
end
To create an instance of your class and display the matrix in LaTeX format:
R = [1/3, 0, 0; 0, 1/3, 0; 0, 0, 1];
obj = Myclass(R);
disp(obj);
When you run this in the MATLAB Live Editor, it should display the matrix R in LaTeX format.
To know more about the "sym" and "latex" function, check out the links below:
https://www.mathworks.com/help/symbolic/sym.html
https://www.mathworks.com/help/symbolic/sym.latex.html
Hope it helps.
Rahul
Rahul 2024-7-15
Hi Jia,
I could the reproduce the issue. According to the code shared, the output does come as a char 'R(1/3,[0,0,1])'. I understand that you require the output in latex formatting.
Here are some of the methods that can give your desired output.
Method 1
You can change the 'disp' function in the classdef 'Myclass' as follows:
function disp(obj)
symMatrixStr = symmatrix('R(1/3,[0,0,1])');
% Addition of 'latex' function to obtain latex representation
symMatrixStrLatex = latex(symMatrixStr);
disp(symMatrixStrLatex);
end
This will give the desired latex output as: \mathrm{R(1/3,[0,0,1])}
You can refer to this link for more information regarding latex function: https://www.mathworks.com/help/releases/R2024a/symbolic/sym.latex.html?searchHighlight=latex&s_tid=doc_srchtitle
Method 2
You can run your existing code in the live editor. The output will not be of latex format. However, if you right-click on the output, you can leverage the option available stating 'copy as LaTex'. This will copy the output in latex formatting to your clipboard.
Hope this helps!

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