Joshua asked . 2023-04-10

why am I getting the error "Incorrect number or types of inputs or outputs for function 'solve'."

my code is; 
syms d;
s=solve('7*d + 3*e=71','d + 2*e=20');
s=[s.d s.e];
disp('1 dollar = ');
s(1)
disp('Eullar');

I am getting the error:

Incorrect number or types of inputs or outputs for function 'solve'.

Error in HW10 (line 2)
    s=solve('7*d + 3*e=71','d + 2*e=20');

The qustion I am solving is:

    "Seven dollars and 3 Euros make 71 Eullars.
    One dollar and 2 Euros make 20 Eullars.
    find out the value of a dollar in terms of Eullars"

solve , error , MATLAB , Language Fundamentals , Numeric Types , Logical

Expert Answer

Prashant Kumar answered . 2024-11-23 16:00:11

For equality inside a symbolic expression, use double equal signs (==) —

syms d e 
s=solve(7*d + 3*e == 71,d + 2*e == 20);
s=[s.d s.e];
disp('1 dollar = ');

1 dollar =

vpa(s(1),3)

ans = 7.45

disp('Eullar');

Eullar

The ability to use character arrays has been removed (depricated). Although ‘e’ was not included in the syms call, I assume it is a variable and not the exponential function e that is the exp function. If it should be ‘exp(1)’ (or the exponential function of some other argument), make the appropriate changes in your code.

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