trying to plot a harmonic function, but i keep getting an fplot error.

code:

clear all

clc

syms x y

u = x^2 - y^2;

for c = 2:2:20

result(:,c) = solve(u == c);

end

fplot(result)

error:

Operands to the logical and (&&) and or (||) operators must be convertible to logical scalar values.

Error in fplot (line 119)

~all(feval_internal(symengine,'symobj::map',formula(fn{k}),'testtype','Type::Arithmetical'))

Answer 1

[Star Strider]

Try this —

syms x y
u = x^2 - y^2;

figure
hold on
for c = 2:2:20
    result = solve(u == c);
    fplot(result)
end
hold off
grid

.