Error using cos.Not enough input arguments.

Hi all,

Can anyone help me with this problem - Error using cos Not enough input arguments.

  A2=sinh((x^2)+cos^2*y)^3/sqrt(abs(x-cos(y))+ln*(abs((x-cos(y)))/(x^2)+(cos^2)*y+abs(sin)*x))
Error using cos
Not enough input arguments.

i am new to matlab and i need to rezolve these expresition.

[Stephen23]

The function cos requires one input argument. As the error message states, you have called cos with no input argument, which throws an error. I have marked those locations for you, showing where you have called it incorrectly:

A2=(sinh((x^2)+(cos^2)*y)^3/sqrt(abs(x-cos(y)))+ln*(abs((x-cos(y))))/(x^2)+(cos^2)*y+abs(sin(y))*x)
%               ^^^^                                                        ^^^^

Your use of matrix operations is also quite likely to be incorrect:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

Answer 1

[Fangjun Jiang]

try this line by line

y=pi
(cos(y))^2
cos^2*y

[Cristian Rosca]

i don't understand because i am beginner in matlab,maybe help me with this code?

[Fangjun Jiang]

You need to provide the original math equation.

[Cristian Rosca]

when x=-1.75*10^-3

y=3*pi

[Fangjun Jiang]

create some interim variables and build up your result

x=-1.75*10^-3;
y=3*pi;
cos_y=cos(y);
temp1=x^2+cos_y^2;
temp2=x-cos_y;

A2=sinh(temp1^3/sqrt(abs(temp2)))+log(abs(temp2/temp1))+abs(sin(y))*x

Answer 2

[Steven Lord]

In mathematics we write but when we implement that in MATLAB we implement it as [not to be confused with .]

x = pi/4;
y = cos(x)
z = cos(x).^2 % compare to y^2
w = cos(x.^2)

[Cristian Rosca]

i don't understand because i am beginner in matlab,maybe help me with this code?

[Steven Lord]

Run those four lines. See that z is the square of y. That is how you compute the square of the cosine of an angle. cos^2(x) is not valid MATLAB syntax.

[Cristian Rosca]

anyway is incorrect:((