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How can you make an input to a symbolic variable?

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varprompt='Enter Variable (space-separated):';
var=inputdlg(varprompt);
syms(sym(string(var)));
eqprompt='Enter Equation (from highest to lowest degree):';
equation=inputdlg(eqprompt);
k=diff(equation)
I dont know what to do. How do you make the program solve the equation? Im having trouble turning the var input to a symbolic variable so that i can use it to solve the equation.

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madhan ravi
madhan ravi 27 Oct 2020
equation = {'x^2 + x'};
diff(str2sym(equation))
ans = 
2x+1
equation = {'x^2 + y'};
eq = str2sym(equation);
syms(symvar(eq))
diff(str2sym(equation), x)
ans = 
2x

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