In the first line of the code, since & operator is used, it checks if both the conditions are met and then only it will execute the consecutive statement. Here if statement is used to check multiple conditions.
#MATLAB IF STATEMENT CODE#
Here the output of the above code is Y= 7 if we print it since 0.921 and 0.990 are greater than 0.9. If not then, it will give the statement as given in the else part. If there are any values greater, than it will give Y = 7 if we print it. If condition checks whether any value is greater than 0.9 or the value assigned to limit. According to the input arguments in the rand function, it will generate 5 random numbers between 0 and 1. In the above example, the limit is assigned a value as 0.9 and rand function is used to generate random numbers. Please find the below examples for better understanding: Example# 5 If statement is for multiple purposes like to compare array or character vectors. Since neither of the above two expressions are true it will execute the else block and display the output as 2. The first expression is xy which is also false. In Example 4, x and y values are assigned as 5. First statement checks whether the condition is true or not, here the expression is to check whether xy which is true, so it will execute the subsequent statement and display the output as z =1. In Example 3, x and y values are assigned as 5 and 3. Please find the above two examples describing the working of elseif statement. Required to end the if-block with the endif statement.Else if block is used between if statement and else 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 ( 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.
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