Ermitteln von Indizes und Werten von Elementen ungleich null (2024)

FAQs

How do you find the index of a nonzero element in Matlab? ›

Description. k = find( X ) returns a vector containing the linear indices of each nonzero element in array X . If X is a vector, then find returns a vector with the same orientation as X . If X is a multidimensional array, then find returns a column vector of the linear indices of the result.

M = min( A ) returns the minimum elements of an array. If A is a vector, then min(A) returns the minimum of A .

C = unique( A , setOrder ) returns the unique values of A in a specific order. setOrder can be 'sorted' (default) or 'stable' . C = unique( A , occurrence ) specifies which indices to return in case of repeated values. occurrence can be 'first' (default) or 'last' .

B = reshape( A , sz ) reshapes A using the size vector, sz , to define size(B) . For example, reshape(A,[2,3]) reshapes A into a 2-by-3 matrix. sz must contain at least 2 elements, and prod(sz) must be the same as numel(A) . B = reshape( A , sz1,...,szN ) reshapes A into a sz1 -by- ...

Remember: MATLAB uses 1-based indexing.

When indexing into a matrix, some languages start at zero. Other languages, such as MATLAB, start at 1.

In other words, a matrix is considered nonzero if it has at least one entry that is not equal to zero. If all the elements of a matrix are zero, it is called a zero matrix. In this 2×2 2 × 2 matrix, both elements on the main diagonal (2 and 3 ) are nonzero.

Start with a value of smallest which is the largest possible value. Then, loop over every item in the array. If it is smaller than smallest, update smallest accordingly and continue. Once the loop is finished, smallest is equal to the smallest value.

Description. [ minA , maxA ] = bounds( A ) returns the minimum value minA and maximum value maxA in an array. minA is equivalent to min(A) and maxA is equivalent to max(A) . [ minA , maxA ] = bounds( A , "all" ) computes the minimum and maximum values over all elements of A .

A = table2array( T ) converts the table or timetable, T , to a homogeneous array, A . The variables in T become columns in A . The output A does not include the table properties in T.

How do you generate distinct random numbers in MATLAB? ›

Execute the rng("shuffle") command once in your MATLAB session before calling any of the random number functions. You can execute this command in a MATLAB Command Window, or you can add it to your startup file, which is a special script that MATLAB executes every time you restart. Now, execute a random number command.

B = squeeze( A ) returns an array with the same elements as the input array A , but with dimensions of length 1 removed. For example, if A is a 3-by-1-by-1-by-2 array, then squeeze(A) returns a 3-by-2 matrix.

To plot a 3D surface from a data file in MATLAB, you will need to have the data file open in MATLAB. Once you have the data file available, you can use the plot3 command to plot the data. The plot3 command will create a 3D plot of the data. You can also use the surf command to create a 3D surface plot.

X = str2num( txt ) converts a character array or string scalar to a numeric matrix. The input can include spaces, commas, and semicolons to indicate separate elements. If str2num cannot parse the input as numeric values, then it returns an empty matrix.

N = nnz( X ) returns the number of nonzero elements in X . When X is a built-in MATLAB^® type, floating-point fi object, or scaled double fi object, N is returned as a double . When X is a fixed-point fi object, N is returned as a uint32 if X has fewer than 2³² elements. Otherwise, N is returned as a uint64 .

To find the index of the element in the array, you can use the find() function. Using the find() function you can find the indices and the element from the array. The find() function returns a vector containing the data.

If A is a vector, then B = any(A) returns logical 1 ( true ) if any of the elements of A is a nonzero number or is logical 1 , and returns logical 0 ( false ) if all the elements are zero.

TF = isnan( A ) returns a logical array containing 1 ( true ) where the elements of A are NaN , and 0 ( false ) where they are not. If A contains complex numbers, isnan(A) contains 1 for elements with either real or imaginary part is NaN , and 0 for elements where both real and imaginary parts are not NaN .