The ones function creates a matrix whose elements are all ones. (The following examples show both vectors and matrices.) MATLAB has a variety of built-in functions to make it easier for you to construct matrices without having to enumerate all the elements. So, using the y matrix defined above, you could specify a subset of y using the colon: The colon causes MATLAB to step in sequence through the numbers specified. You can also specify a range of numbers in a defined vector or matrix using the colon operator. You can specify a value in matrix y the same way: If x is already defined as a vector of the form then you can define a new variable as a subset of x by using the index of the specific value in vector x. This means that the first element always has index (1,1), not (0,0). It is important to note that MATLAB indexes matrices in the following manner:
Vectors and scalars are initialized the same way as matrices. (In MATLAB 4, the * operator is not required in complex numbers, as it was in previous versions.) In the example above, the expression 4 + 5i, with the + sign surrounded by blanks, would represent two separate numbers. When entering complex numbers as matrix elements within brackets, it is important to not use blanks.
You can also initialize matrices with complex numbers: (Note: You can also use the semicolon after an expression or statement to suppress printing or to separate statements.) Within the square brackets that are used to form vectors and matrices, you can use a semicolon to end a row. Where each value may be rational or complex numbers. The most straightforward way to initialize a matrix is to type a command of the form:
DOES NOT EQUAL SIGN DOMAIN KEYBOARD MAC
Start the program from Windows or Mac OSX. You need to be on CMU network or VPN to CMU network to use MATLAB. Greatly borrowed from MIT's MATLAB on Athena tutorial ()
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