Index of maximum value in array matlab software

How do i take the maximum value of every 5 elements of it. Feb 15, 2018 if you only need the position of one occurrence, you could use the syntax finda8,1. Note that there can be the max value at more than one location. If a is a matrix, then maxa is a row vector containing the maximum value of each column.

Mathworks is the leading developer of mathematical computing software for engineers and. I need to get the index associated with the first maximum or minimum value in the array. Efficient way to index values in an array matlab answers. Find maximum values in input or sequence of inputs matlab. Matlab treats the array as a single column vector with each column appended to the bottom of the previous column. I got the value using the following code but i have the nan value in pbest in loops it is giving errors. You can also specify a direction if you specifically want the first or last occurrence, such as finda8,1,first. The stored vector contains the sequence of elements 12, 45, 33, 36, 29, 25, 91, 48, 11, and can be displayed using a single colon. Maximum returns an object, maxobj, that computes the value and index of the maximum elements in an input or a sequence of inputs. Actually the code is correct, and 4 is the linear index of the value 5. How to find the index of maximum value in matrix matlab. Find maximum values in input or sequence of inputs. I need to find the index for the minimum value in pbest other than 0. How to get maximum value from any plotx,y in matlab quora.

This is the whole array and its corresponding linear indices. How do i find the indices of the maximum or minimum value of my. If a is a matrix, then max a is a row vector containing the maximum value of each column. Mar 26, 2018 so basically if you want to plot anything, of course you need to have the data set. For example, in my case that function should return 7 as the maximum value and 4 as the index. In this example, to get the maximum value in the index range 2, 6 inclusive you would have max45, 78, 4 instead of max9, 45, 78, 2, 4. I have a 3d matrix 40x181x361, i want to find the index for the maximum value for each of the 40. To get the rows and columns instead of linear indexes, you can use ind2subs or find. Afterwards the final max finds the maximum of the above, which corresponds to the second maximum. Data input 6 1 1 3 3 9 7 2 2 4 5 1 8 6 0 2 1 5 3 0 2 4 1 17 maximum values 6 9 5 4 8 6 2 17 0 0 0 0 max index array 1 3 3 2 1 1 2 3 1 1 1 1 in the value and index mode, the block outputs. Lets say you have x time and y velocity in order to find the maximum value, you need to employ some matlab functions max and find. Finding the position of the 1st,2nd and 3rd max value in a matrix.

Coupling a minmax with a find nonzero elements blocks as in the suggestion on this page does do the trick, but it comes with the problem that the output of the find block is a variablesized signal. May 31, 2018 what i want is to find the maximum, i. Jun 07, 20 hello researchers i need guidance, as i have a matrix h1 of 15761024, which is vertical concatination of four channels, in h1 for continuous four rows it represent one frame of each channel, i need to find maximum and second value for every four group of rows. How to calculate index of minimum value in cell array. The value of the maximum where the logical index is zero, is left out. If the largest value occurs more than once, then y contains the index to the first occurrence of the value. If a is a multidimensional array, then max a operates along the first array dimension whose size does not equal 1, treating the elements. Feb, 20 i have an output value matrix depending on 3 inputs ranging from p10 to p11, p20 to p21, p30 to p31. Hi all, i have to find the index of the same value in an array,see the following example. Get max value and index of multidimensional array matlab. I believe op wants the maximum element along all dimensions. I refrained from doing this because the map function reduces the resolution and it is likely that the values stored in the mymeasurements array are close to each other, i. How do i find the indices of the maximum or minimum value. If sizea,dim is 0, then mina,dim returns an empty array with the same.

Finding maximum value and its location from the matrix matlab. I need to automize a step search from gauss1,1 so that i end up finding gauss2,2 in this entire matrix. Sep 22, 2017 actually the code is correct, and 4 is the linear index of the value 5. A linear index allows use of a single subscript to index into an array, such as ak. Find maximum values in an input or sequence of inputs. Find value in cell array and return index matlab answers. I know i can use min function but this only gives one smallest value. Finding index for minimum value in array matlab answers. May 09, 2017 hello, i have a cell array by name m1 of size 374 3 where m11,11 8,m11,218 and m11,311totally there are 17 cellsnow i want minimum value index from all this cells. The content of the mymeasurements array is coming from the adc analogread and hence it is 10 bits 01023. Some problems require information about the locations of the array elements that meet a condition rather than their actual values.

I have an array, i need to be able to select 2, or 4 or so on n minimum smallest values from the specific array. What i want to do is analyse only the peak values for each element in mxn over t, so i would end up with a single 2d matrix of mxn containing only max values i know there are are ways to get a single overall max value, but is there a way to combine this with. I have tried maxabsfigure, but that generates an array and not a particular single value, i am in need to find the maximum single amplitude value of the. The sizem,dim is 1, while the sizes of all other dimensions remain the same, unless sizea,dim is 0. In this example, to get the maximum value in the index range 2, 6 inclusive you would have max45, 78, 4 instead of max9, 45.

Find index of same values in array matlab answers matlab. The maximum value over each frame of data along the channel. Pramod kumar jangir on 20 oct 2019 accepted answer. Learn more about maximum, minimum, max, min, index, array, matrix, find. How can i find the index of the maximum element of this array. Check for identical maximum values in an array matlab. That is, the array starts at 1 the initial value, increments with each step from the previous value by 2 the increment value, and stops once it reaches or to avoid exceeding 9 the terminator value. He is using the name argmax for it and the made up function argmaxa. The min and max functions in matlab return the index of the minimum and maximum values, respectively, as an optional second output argument. Say we have an array named mymeasurements int mymeasurements93,4,8,12,7,2,1,67,8. May 03, 2012 i want to find the 2nd minimum value in an array.

How do i find the indices of the maximum or minimum. I know, that number, for example, 5, is an element in array x, but i dont know its index. What is the function returning the maximum value and its index. If a is a vector, then max a returns the maximum of a. The x and y should have display x 9, y 1, instead it displays x 4, y 5. I need to find out the minimum value of the matrix and the corresponding row and column index. How to find the index of the maximum value in an array. While the following array is displayed as a 3by3 matrix, matlab stores it as a single column made up of the columns of a appended one after the other. At present,i am clicking with the help of cursor after the generation of the 3d plot.

How can i find the maximum value and its index in array in. The minmax block does not offer an option to output the index of the first maximum value. Dimension dim indicates the dimension whose length reduces to 1. Follow 57 views last 30 days khawaja asim on aug 2011. This works for the 2d case but if ndimsa2, then maxmaxa will return a matrix. Then you only need to find a way to determine which nodes you minimally need to check to find the maximum value in the range queried. So basically if you want to plot anything, of course you need to have the data set. Mathworks is the leading developer of mathematical computing software for. This applies when you set the roiform property to lines or rectangles set this property to true to return the validity of the specified label numbers. Finding maximum value and its location from the matrix. For example, the following code produces a row vector m that contains the maximum value of each column of a, which is 3 for the first column and 4 for the second column. These approaches are indexing by position, linear indexing, and logical indexing. Look up logical indexing in matlab for more details. If you call max with two output arguments, then you will also get the index.

How to find index of first 3 maximum number in matrix matlab. Retrieving maximum value from a range in unsorted array. Find indices and values of nonzero elements matlab find. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. I have a few multidimensional matrices of dimensions mxnxt, where each element in mxn is an individual sensor input, and t is time. This applies when you set the roiform property to label matrix.

May 06, 2014 i need to find the index for the minimum value in pbest other than 0. The box number index value of all points in that box. In this case, the logical array being used as an index is the same size as the other array, but this is not a requirement. In matlab, there are three primary approaches to accessing array elements based on their location index in the array. To find the maximum value in a matrix learn more about matrix matlab. Please read the matlab documentation, just type the word doc follow by the function you want to use and execute, matlab shows you all you need. How to find the maximum value of the 3d plot in matlab. How can i find the index of the maximum value in a given. Finding 2nd minimum value in an array matlab answers. Mathworks is the leading developer of mathematical computing software for engineers and scientists. How to get the index of maximum value in each row of a matrix. Find index in 3d matrix for maximum value matlab answers.

Matlab elementbyelement max values in multidimensional. Is there any other way to find the min value other than zero and also to find its index. Maximum name, value sets properties using one or more name value pairs. I realized this function, using for loop and if statement, but did matlab doesnt have buildin similar function.

This matlab function returns the maximum elements of an array. If no value is specified, then the default is the first array dimension whose size does not equal 1. I have written the following matlab code that is supposed to return the maximum value in an array. Hello, i have a cell array by name m1 of size 374 3 where m11,11 8,m11,218 and m11,311totally there are 17 cellsnow i want minimum value index from all this cells. Sep 28, 2017 the minmax block does not offer an option to output the index of the first maximum value. Minimum elements of an array matlab min mathworks australia.

Write max at the command line and press f1 for help if on a windows system, other systems will use another key and read the documentation. If you only need the position of one occurrence, you could use the syntax finda8,1. Then moving to the box to the right, the second box, all the points in this box will be assigned the index value of 2. Indices of the maximum values in array x, returned as a scalar, vector, matrix, or multidimensional array. There are many tutorials out there to get you the basic matlab functions familiar. Im looking to assign all the points in the first box, starting from the bottom left corner of the grid the index value of 1. If there are several identical maximum values, the index of the first one found is returned. Sep 14, 20 write a matlab script that finds the maximum value and its m and n indexes in each of the p pages. Unless the map function is used, they cannot be declared as a byte. Finding miminum and maximum of function fx matlab answers. If a is a vector, then mina returns the minimum of a if a is a matrix, then mina is a row vector containing the minimum value of each column if a is a multidimensional array, then mina operates along the first array dimension whose size does not equal 1, treating the elements as vectors. Oct 07, 2009 the min and max functions in matlab return the index of the minimum and maximum values, respectively, as an optional second output argument. How can i find the index of the maximum value in a matrix column in matlab.