1:10
, 1:2:10
100:25:0
do? Think, then check.x = [2 5 1 6]
. What will x(3)
, x([1 2])
, x([1:end])
, x(end:1:1)
, x(:)
, x([1 1 1 1])
do? Think, guess, discuss with a friend, and finally, verify.,
) are the separator between columns, while a semicolon (;
) separate between rows. Figure out how to create the following matrices: \(\begin{pmatrix} 1& 2& 3\\ 4&5&6 \end{pmatrix}\), \(\begin{pmatrix} 1& 0 &1 \\ 0& 1& 0 \end{pmatrix}\)[ 6 (1:5) 7 ]
makes sense (what does it result in?) Similarly you can create a matrix by stacking column vectors next to each other (using a space or a comma) or row vectors on top of each other (using a semicolon). Create the following matrix using a relatively short line of code:\begin{equation} \begin{pmatrix} 1 &2&3&4&5&6&7&8&9&10\\ 1&4&9&16&25&36&49&64&81&100\\ 2&4&8&16&32&64&128&256&512&1024 \end{pmatrix} \end{equation}
Can you now easily make the first list go up to 100 (and the others follow suit)? If not, solve the problem again so that you can do it.
The plot
command plots a list of points given as two vectors, \(X\) and \(Y\) of their x and y coordinates, respectively. The default behaviour is that no mark is placed on the points, and the points are joined by a straight line. So if we want to plot a parabola \(y=x^2\) for \(x\in[1,1]\) we can write:

Graphing a simple function, y=x^2. 
We could make that line green by adding a third input:

Stylizing the graphs with colors and line markers. 
The resulting plot need not be a function in the mathematical sense of the word:

Graphing a nonfunction in MATLAB®. 
Exercise 10. Read the helpfile on plot
by typing help plot
and figure out how to do the following:
plot
command, and plot \(\sin x\) and \(\cos x\) vs. \(x\).