Having problems with display function

Question

Viet Anh Nguyen 2021-1-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/711968-having-problems-with-display-function

回答： Walter Roberson 2021-1-8

Why can't I put the variable from a solve function into a display function? For example:

syms x
y=x+3
sol=solve(y==0)
disp("sol is" + sol)

There is an error with the display function and I don't know how to fix it. Also, what type of data is the outcome of the solve function?

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Answer 1

Walter Roberson 2021-1-8

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https://ww2.mathworks.cn/matlabcentral/answers/711968-having-problems-with-display-function#answer_593753

在 MATLAB Online 中打开

disp("sol is " + string(sol))

The output of solve is sym if a single variable is being solved for, or in some cases where multiple outputs are given, and otherwise is struct.

You have a conflict over whether the + operation should be the concatenation operation of the string object "sol is" or if it should be symbolic addition associated with the sym result of solve. Addition happens to win, and that is a problem for you.