How do I make fprintf to show symbolic math?

Question

Rustem 2018-2-14

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评论： Walter Roberson 2020-5-28

I am solving for sigma_y and I used the solve function and symbolic math. In the end I need fprintf to display the formula in the form 'v*sigz', but it doesn't do this with the current fprintf. The pictures are there to better explain what I am doing.

syms epsy E sigy v sigx sigz
epsy = 0
sigx = 0
eqn = epsy == (1/E)*(sigy-(v*(sigx+sigz)))
sigy = solve(eqn,sigy)
fprintf('%0.2f mm.\n',sigy)

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Answer 1

Walter Roberson 2018-2-14

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fprintf('%s mm.\n', char(sigy))

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Lam Nguyen Van 2020-5-25

Help me! I want to fprintf equation matrix:

Walter Roberson 2020-5-25

You cannot fprintf symbolic expressions in "pretty" formats. fprintf can only output characters in the first 16 bits of the Unicode planes.

https://www.compart.com/en/unicode/U+2093 shows subscript x in Unicode. However there is no subscript y.

Anything like the tall { cannot be created in Unicode.

The closest you can get in such cases is to emit encodings of the equations, such as using latex or MathML.

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Answer 2

Lam Nguyen Van 2020-5-28

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Help me! I want to creat a Symbolic Matrix:

A = [ε  ε  ε;
        ε  ε  ε]

I used the command, but:

syms A epsilon
epsilon = [  char(949) char(949)  char(949) 
                    char(949) char(949)  char(949) ]
epsilon (2)
epxilon = sym('epsilon', [2 3])
A = zeros (2, 3);
for i = 1:6
    epsilon = char(949);
    A(i) = epsilon;
end
A