Syntax: function outputparams functionname (iputparams) Statements end The function starts with the keyword function. MATLAB also allows the users to define their own functions. PS: The above plots were made in octave rather than in matlab, because I don't have matlab at home. MATLAB has several predefined functions which are ready to use such as sin (), fact (), cos () etc. Type help plot at the matlab terminal to see more options for the plot command. If you wanted to see just the individual points of your array instead, you can specify this as the third argument: plot(x, y, 'o') In Matlab there are trig functions for both radians and degrees (e.g. You can now plot this using the plot command, which takes two arrays of the same size and plots all points in the first array against their equivalent points in the second array, as (x,y) pairs: plot( x, y ) Īs you can see, matlab 'connects' the points by default. As a Matlab user transitioning to R, I have ran across the problem of applying trigonometric functions to degrees. The result is an array y of the same size as x. With that in mind, you can now calculate your f(x) for each point in the array x, by using elementwise operations: y = exp( sin(x).^3 ) + x.^6 - 2*(x.^4) - x.^3 - 1 Therefore to raise all elements of the array x to the power of 6, you would do x. By convention, matlab uses 'dot-operators' to denote 'elementwise' operations, as opposed to 'undotted' ones denoting primarily 'matrix' operations. Now that you have your array x you can perform operations on it. % see the contents of your array, remove it at the end. % Note: the ' ' at the end suppresses output if you want to So instead I would suggest you create an array of values between, and obtain the value of y for each of them, which in matlab can be done as a single operation because it's good at working with arrays and performing such 'vectorized' operations: x = % Create an array of values from -2 to 2, with a step of 0.1 You could use fplot with an anonymous function as Neo suggested, but I find that beginners find that confusing. The inverses, e.g., arcsin, arctan, etc., are calculated. The sin function, similarly, if given an array of numbers, will calculate the sin for each of those numbers, and return an array of the same shape as its input. Trigonometry: The basic MATLAB trig functions are sin, cos, tan, cot, sec, and csc. If you pass an array to exp, it will perform this function 'elementwise', and return appropriately. While you could in theory compute e and then use the power operator ( ^ in matlab) to raise e to that power accordingly, this is in fact a less precise way of calculating the exponential function, and therefore matlab provides the exp function for that purpose. raising e to the power of x is known as the exponential function. The e is known as Euler's constant, where e ~ 2.71828.

Let's cover all the points in no particular order:

Trig functions in matlab