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There are three statement parts in Matlab that are if statement, if else statement, else if statement.For the false expression, an if statement is always followed by an else statement.Now, let’s get details on what is if else statement in Matlab. All of these are used for different purposes. There are different types of conditional statements that are used for decision making, such as if statement, if else statement, nested statements, and much more. The flow of this can describe how the conditional statements work: If the given condition is true, then it will execute if not, the next statement will be executed of the program. Its structure needs that the coding must have one or more conditional statements that are tested or executed by a programmer. But, before proceeding to the details, let’s get brief details on decision making in Matlab. This blog will provide you information on if else statement in Matlab and what is the syntax of this statement. All these statements are based upon the decision-making method in Matlab. If one statement is true, it will provide the result otherwise, it will jump to another statement, then produce the result accordingly. Required to end the if-block with the endif statement.In Matlab, there are several statements that need to be executed as per the conditional statements. You are not required to have an elseif or else block, but you are The basic form of the if-block is demonstrated in the program above. Also, tryĬhanging the other variables and experiment. Try changing the value of the variableĭecision to see what actions the script will take. You can execute the instructions in the file by simply typing ifDemoĪt the matlab prompt. The most basic structure for anĭecision = 3 leftx = 0 rightx = 1 lefty = 1 righty = 1 N = 10 h = ( rightx - leftx ) / ( N - 1 ) x = ' A = zeros ( N ) for i = 2 : N - 1, A ( i, i - 1 : i + 1 ) = end A = A / h^ 2 A ( 1, 1 ) = 1 A ( N, N ) = 1 b = sin ( x ) b ( 1 ) = lefty b ( N ) = righty if ( decision 3 ) % Find and plot the eigen values of inv(A) = eig ( inv ( A )) e = diag ( e ) plot ( real ( e ), imag ( e ), 'rx' ) title ( 'Eigen Values of the inverse of the matrix' ) else % Solve the system y = A \ b linear = ( lefty - righty + sin ( leftx ) - sin ( rightx )) / ( leftx - rightx ) constant = lefty + sin ( leftx ) - linear * leftx true = - sin ( x ) + linear * x + constant subplot ( 1, 2, 1 ) plot ( x, y, 'go', x, true, 'y' ) title ( 'True Solution and Approximation' ) xlabel ( 'x' ) ylabel ( 'y' ) subplot ( 1, 2, 2 ) plot ( x, abs ( y - true ), 'cx' ) title ( 'Error' ) xlabel ( 'x' ) ylabel ( '|Error|' ) end There are times when you want certain parts of your program to beĮxecuted only in limited circumstances. Greater than 3 the eigen values of the inverse of the matrix are foundĪnd plotted, otherwise, the system is inverted to find anĪpproximation to y’=sin(x) according to the specified boundary If this variable is less than 3, theįile will find and plot the eigen values of the matrix, if it is The file is called by Matlab, and it constructs a second derivativeįinite difference matrix with boundary conditions. Here we will define an executable file that contains an if statement. Rate of change is discontinuous, you may want to change the rate ForĮxample, if you are approximating a differential equation, and the
#MATLAB IF STATEMENT CODE#
There are times when you want your code to make a decision. ( Plotting), executable files ( Executable Files), or ( Vector Functions), loops ( Loops), plotting ( Introduction to Vectors in Matlab), matrices ( Introduction to Matrices in Matlab), vector operations More information on those topics see one of our tutorials on vectors
#MATLAB IF STATEMENT HOW TO#
In this tutorial we will assume that you know how to create vectorsĪnd matrices, know how to index into them, and know about loops.