Undefined Function or Method X for Input Arguments of Type Y If you just want to calculate the transpose without complex-conjugating the values, use. To sum up, if you intend to calculate the Hermitian conjugate, the complex conjugate transpose, then use ' (without the period). We see, that in addition to the transposition, the complex values have been transformed to their complex conjugates as well. The output is as expected, the transposed form of C. Let's take the transpose using the shorthand. What "correct" is depends on your application.Ĭonsider the following example of a matrix C containing complex numbers: > C = But as soon as we deal with complex numbers, we will inevitably run into problems if we do not use the "correct" shorthand. As long as the transposed vector or matrix is real-valued, the two operators produce the same result. If you would only write ' (without the point), you are in fact using the ctranspose command instead, which calculates the complex conjugate transpose, which is also known as the Hermitian conjugate, often used in physics. Just as = becomes an evaluation of the eq function, think of. Like other MATLAB commands, these operators are "syntactical sugar" that gets turned into a "proper" function call at runtime. The two commands are very similar, but conceptually very distinct. * multiplies elements of matrices together. This is in keeping with the syntax for the other element-wise operations in MATLAB: * multiplies matrices. ', there is a period in front of the apostrophe. Hermitian conjugate) of a vector or matrix in MATLAB. ' is the correct way to take the complex conjugate transpose (a.k.a.' is the correct way to transpose a vector or matrix in MATLAB. The string is in fact contained in the cell, i.e. Note how the single quotes and the indentation are artifacts to notify us that c is a cellstring rather than a char. In fact, those are artifacts that the command window uses to distinguish between some types. It might happen that you want to get rid of the ' in your strings, although you never added them. It does not focus on explaining the difference between char and cellstring. What you see is NOT what you get: char vs cellstring in the command window MATLAB will first try to apply our syntax to the variable, rather than using the method. This output is telling us that sum is first a variable and that the following methods (functions) are shadowed by it, i.e. Use which() with the -all flag: which sum -allīuilt-in (C:\Program % Shadowed double method How can we check if a function already exists to avoid this conflict? We will get the cryptic error: Subscript indices must either be real positive integers or logicals.Ĭlear() the variable first and then use the function clear sum As a result, if we name a variable with the same name sum = 1+3 Īnd if we try to use the function while the variable still exists in the workspace A = rand(2) Do not name a variable with an existing function name
0 kommentar(er)
