#Comment in matlab series#
The factor function factorizes an expression and the simplify function simplifies an expression.In R2010b we made a series of improvements to the “comment wrapping” feature in the MATLAB Editor. % first of all load the package, make sure its installed.įactorization and Simplification of Algebraic Expressions Notice the use of Sin and Cos, which are also defined in symbolic package. When you work with many symbolic functions, you should declare that your variables are symbolic but Octave has different approach to define symbolic variables. The following example demonstrates the concepts − You need to have symbolic package, which provides expand and the collect function to expand and collect an equation, respectively. When you work with many symbolic functions, you should declare that your variables are symbolic.Įxpanding and Collecting Equations in Octave The expand and the collect function expands and collects an equation respectively. In same way, you can solve larger linear systems as given below −Ģx + 4y + 3z = 8 Expanding and Collecting Equations in MATLAB Such a system of linear equations can be written as the single matrix equation Ax = b, where A is the coefficient matrix, b is the column vector containing the right-hand side of the linear equations and x is the column vector representing the solution as shown in the below program − Let us take up a simple example to demonstrate this use. We have a little different approach to solve a system of 'n' linear equations in 'n' unknowns.
Consider the following set of equations −Ģx + 4y + 3z = 8 Solving System of Equations in Octave
In same way, you can solve larger linear systems. The solve function can also be used to generate solutions of systems of equations involving more than one variables. The following example solves the fourth order equation x 4 − 7x 3 + 3x 2 − 5x + 9 = 0. Please note that the last two roots are complex numbers. When you run the file, it returns the following result −
#Comment in matlab code#
The following example solves the fourth order equation x 4 − 7x 3 + 3x 2 − 5x + 9 = 0.Ĭreate a script file and type the following code −Įq = 'x^4 - 7*x^3 + 3*x^2 - 5*x + 9 = 0' ĭisp('The fourth root is: '), disp(s(4)) ĭisp('Numeric value of first root'), disp(double(s(1))) ĭisp('Numeric value of second root'), disp(double(s(2))) ĭisp('Numeric value of third root'), disp(double(s(3))) ĭisp('Numeric value of fourth root'), disp(double(s(4))) You can get the numerical value of such roots by converting them to double. In case of higher order equations, roots are long containing many terms. For example, let us solve a cubic equation as (x-3) 2(x-7) = 0 The solve function can also solve higher order equations. When you run the file, it displays the following result − The roots function is used for solving algebraic equations in Octave and you can write above examples as follows −ĭisp('The second root is: '), disp(s(2)) Solving Basic Algebraic Equations in Octave Where, you can also mention the variable.įor example, let us solve the equation v – u – 3t 2 = 0, for v.
If the equation involves multiple symbols, then MATLAB by default assumes that you are solving for x, however, the solve function has another form − You may even not include the right hand side of the equation − You can also call the solve function as − MATLAB will execute the above statement and return the following result − In its simplest form, the solve function takes the equation enclosed in quotes as an argument.įor example, let us solve for x in the equation x-5 = 0 The solve function is used for solving algebraic equations. Solving Basic Algebraic Equations in MATLAB We will also discuss factorizing and simplification of algebraic expressions. But for solving basic algebraic equations, both MATLAB and Octave are little different, so we will try to cover MATLAB and Octave in separate sections. So far, we have seen that all the examples work in MATLAB as well as its GNU, alternatively called Octave.
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