Nov 29, 2011 hi, i want to find the position of the 1st,2nd and 3rd maximum value of a matrix. For example, if a is a matrix, then max a, 1 2 computes the maximum over all elements in a, since every element. Note that there can be the max value at more than one location. Matlab matrix laboratory is a multiparadigm numerical computing environment and proprietary programming language developed by mathworks. If time were an array rather than a vector and youre using release r2018b or later of matlab, you can use max. Matlab allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages although matlab is intended primarily for numerical. If your plot is available in another form, please specify it exactly. This vector contains all the maximum values in the respective column. For example, if a is a matrix, then max a,1 2 computes the maximum over all elements in a, since every element of a matrix is contained in the array slice defined by dimensions 1 and 2. I need to automize a step search from gauss1,1 so that i end up finding gauss2,2 in this entire matrix.
Find max value with index matlab answers matlab central. Finding miminum and maximum of function fx matlab answers. Maximum of timeseries data matlab max mathworks united. The max function will return both the maximum value, and the index position of the value. How to get the index of maximum value in each row of. I need that to inpaint the labeled areas in my own algorithm using new pattern. Feb, 20 i have an output value matrix depending on 3 inputs ranging from p10 to p11, p20 to p21, p30 to p31. How do i find the indices of the maximum or minimum. Apr 11, 2016 ive tried using this code and it works great in version r2019b with a caveat. Find index in 3d matrix for maximum value matlab answers. Respected sir, thanks very much for the clarification. Just i want is the how to get the index value of pixels of each labeled area in to arrays separately.
I got a x value of 14,14 with this and thats the 3 peak, but i see now that i may need to write my full script here because i cant use max f command because i use syms z. C max a, b, nanflag also specifies how to treat nan values. Learn more about matlab, vector, matrix, matrices, matrix manipulation matlab, statistics and machine learning toolbox. Learn more about max value and its corresponding value. Organizing your code in functions can help prevent this problem. The minmax block does not offer an option to output the index of the first maximum value. Mathworks is the leading developer of mathematical computing software for engineers and scientists. I have a 586 array where the columns are the variables and the rows are the samples that represent a time series of eeg data sampled at 256 hz. I am attaching my code for your kind reference,the code is for finding out the max frequency response. The maximum values are not necessarily from the same date.
Finding max value and its index matlab answers matlab. I need to get the index associated with the first maximum or minimum value in the array. How to find index of first 3 maximum number in matrix matlab. How can i find the index of the maximum value in a matrix. 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. How do i find the indices of the maximum or minimum value. How do i find the indices of the maximum or minimum value of my. Mar 07, 2019 i will assume you need to find both the maximum value in b1 as well as its corresponding a1 value. 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.
I have a 3d matrix 40x181x361, i want to find the index for the maximum value for each of the 40. Finding the last maximum value in a vector matlab answers. M max a,all,nanflag computes the maximum over all elements of a when using the nanflag option. Find k largest elements of array matlab maxk mathworks. May 31, 2018 what i want is to find the maximum, i.
I know that i can find the position of the max value using find function like. Though if you want the linear index second output, you need to use release r2019a or later. Be aware, that the above method replies one value only, even if the maximum value appears several times in the data. You can use the index to extract the corresponding a1. Finding maximum value and its location from the matrix. How to find maximum value in a plot matlab answers matlab. If i say that i want to find out at which index after this index i mean the above we calculated the value become x ghulam on 4 nov 2019. To get the rows and columns instead of linear indexes, you can use ind2subs or find. The min and max functions in matlab return the index of the minimum and maximum values, respectively, as an optional second output argument. Actually the location of every pixels inside each label. If you call max with two output arguments, then you will also get the index.
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 to obtain max value of a plot matlab answers matlab. I will assume you need to find both the maximum value in b1 as well as its corresponding a1 value. Jul 17, 2018 i have a 3d matrix 40x181x361, i want to find the index for the maximum value for each of the 40. Finding the position of the 1st,2nd and 3rd max value in a.
M max a,all finds the maximum over all elements of a. Finding the maximum value in a loop matlab answers. As i mentioned in the code i am going to convert the rgb image into black and white image and then labels it. Organizing your code in functions can help prevent. M max a,vecdim computes the maximum over the dimensions specified in the vector vecdim. Mar 12, 2014 if time were an array rather than a vector and youre using release r2018b or later of matlab, you can use max. Regarding the same question of finding the index of max value.
Hi, i want to find the position of the 1st,2nd and 3rd maximum value of a matrix. Mar 14, 2018 get exact indices of max value in 3d matrix. Mar 05, 2017 the index value of each pixel i meant is the location of pixelsrow, col values. The x and y should have display x 9, y 1, instead it displays x 4, y 5. Ive tried using this code and it works great in version r2019b with a caveat. For example, tsmax maxts,quality,99,missingdata,remove defines 99 as the missing sample quality code, and removes. I am sure this is so simple but i cant work it out. The min and max functions in matlab return the index of the minimum and maximum values, respectively. Get max value and index of multidimensional array matlab. 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. Suppose i have a matrix that has time in column one and other values in column two a 1 2. Get exact indices of max value in 3d matrix matlab answers. I got a x value of 14,14 with this and thats the 3 peak, but i see now that i may need to write my full script here because i cant use maxf command because i use syms z.
Learn more about max, kmeans, cluster, value, vector, max value, clustering, data clustering. Mar 18, 2015 thanks but it still wont give me the first peak. This is a simple example but in my big matrix there might be more than an answer. Get exact indices of max value in 3d matrix matlab. Mar 22, 2015 finding max value from matlab variable. Finding maximum value and its location from the matrix matlab. If a is a matrix, max a treats the columns of a as vectors, returning a row vector containing the maximum element from each column. I have a question regarding max command in matlab lets say i have x and y matrices. Mathworks is the leading developer of mathematical computing software for engineers and. There are many tutorials out there to get you the basic matlab functions familiar. To get this, assign the result of the call to max to a two element vector instead of just a single variable.
How can i find the maximum value and time array in matlab. Follow 143 views last 30 days gabriel on 14 feb 2016. Though if you want the linear index second output, you. Find the max value and index of each interval in a big. As per the way suggested by your goodself,the zmax occurs at 1,1, and the max value is 0. One could also use a matlab function block and use the matlab min or max function as above, but matlab function blocks take obnoxiously long to compile and often generate code with a lot of gunky overhead.
Do which max to confirm this, and if its the case, clear your workspace to fix it. Learn more about matlab, functions, array, maximum, minimum, matlab function. How to find the maximum value of the 3d plot in matlab. Finding max value and its index matlab answers matlab central. 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 to know about the function and almost every time with good examples on how to use that function.