Define greater than relation
Use assume and the relational operator
> to set the assumption that x is greater than
3:
syms x assume(x > 3)
Solve this equation. The solver takes into account the assumption on variable
x, and therefore returns this solution.
solve((x - 1)*(x - 2)*(x - 3)*(x - 4) == 0, x)
ans = 4
Use the relational operator > to set this
condition on variable x:
syms x cond = abs(sin(x)) + abs(cos(x)) > 7/5;
for i = 0:sym(pi/24):sym(pi)
if subs(cond, x, i)
disp(i)
end
endUse the for loop with step π/24 to
find angles from 0 to π that satisfy that
condition:
(5*pi)/24 pi/4 (7*pi)/24 (17*pi)/24 (3*pi)/4 (19*pi)/24
Calling > or gt for
non-symbolic A and B invokes
the MATLAB® gt function.
This function returns a logical array with elements set to logical 1
(true) where A is greater than B;
otherwise, it returns logical 0 (false).
If both A and B are
arrays, then these arrays must have the same dimensions. A
> B returns an array of relations A(i,j,...)
> B(i,j,...)
If one input is scalar and the other an array, then
the scalar input is expanded into an array of the same dimensions
as the other array. In other words, if A is a
variable (for example, x), and B is
an m-by-n matrix, then A is
expanded into m-by-n matrix
of elements, each set to x.
The field of complex numbers is not an ordered field. MATLAB projects
complex numbers in relations to a real axis. For example, x
> i becomes x > 0, and x
> 3 + 2*i becomes x > 3.