12/17/2023 0 Comments If statement matlab![]() ![]() Required to end the if-block with the endif statement. 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 ![]() There are times when you want your code to make a decision. ( Plotting), executable files ( Executable Files), or ( Vector Functions), loops ( Loops), plotting It started out as a matrix programming language where linear algebra programming was simple. ( Introduction to Vectors in Matlab), matrices ( Introduction to Matrices in Matlab), vector operations MATLAB Tutorial - MATLAB is a programming language developed by MathWorks. More information on those topics see one of our tutorials on vectors Exactly one of the four assignments to x is executed, depending upon the values of the three logical expressions, A, B, and C.In this tutorial we will assume that you know how to create vectorsĪnd matrices, know how to index into them, and know about loops. The latter is used in a linear sequence of conditional statements with only one terminating end. The former introduces a new, nested, if, which must have a matching end. ![]() else if, with a space between the else and the if, differs from elseif, with no space. ![]() The second block of statements executes if the first expression has any zero elements and the second expression has all nonzero elements. Elseif (MATLAB Function Reference) MATLAB Function Referenceĭescription The elseif command conditionally executes statements. ![]()
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