If x is a multidimensional array, then find returns a column vector of the linear indices of the result. Is there any other way to find the min value other than zero and also to find its index. You can also find the max and return an ordered vector w the position but not the min. Sep 29, 2012 find min value in 4d matrix and index of min. Finding the index number that corresponds to a specific value. Find index of same values in array matlab answers matlab. The minimum values are not necessarily from the same date. I want to index it so something like row col find qminq the problem is that this will index all of the 1s. If a is a matrix, then min a is a row vector containing the minimum value of each column. Dec 02, 2014 finding index of min value in a matrix. 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 find first min value and index it matlab answers. There are many tutorials out there to get you the basic matlab functions familiar.
As an alternative version, combine min to get the minimum value and find to return the index, if youve already calculated the minimum then just use find. Jul 05, 2016 this does create some syncing issues, when say, you want to find a video frame that occurs at t 2. Find an element of a matrix equal to a constant matlab. Find index of matrix with smallest value stack overflow. If x contains no nonzero elements or is empty, then find returns an.
May 06, 2014 i need to find the index for the minimum value in pbest other than 0. Find minimum and maximum for each row, matlab in mathematics. How to find minimum or maximum value matlab answers. Feb 03, 2017 here i want to find out approximately equal value of z in acf and also location of the acf value. May 03, 2012 i want to find the 2nd minimum value in an array. I know i can use min function but this only gives one smallest value. Mar 27, 2015 you will see updates in your activity feed.
Finding 2nd minimum value in an array matlab answers. Learn more about find minimum value greater than zero in the rows. How to find the index of the closest value to some number in. To find min or max in a subset of a vector if a is a vector and lowerbound and upperbound are the bounds of the vector among which you need to find the max or min value, then use this command value, index minalowerbound. Finding index for minimum value in array matlab answers. If x is a vector, then find returns a vector with the same orientation as x. Nov 21, 20 finding the index number that corresponds to a. 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. If you want to treat the matrix like a vector you can use which.
To get this, assign the result of the call to max to a two element vector instead of just a single variable. The minmax block does not offer an option to output the index of the first maximum value. 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. How to find the index in 1d array that has closest value to some number. Maximum elements of an array matlab max mathworks switzerland.
If you plot x versus y, the values are known and therefore the problem has not relation to the plotting. 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. Based on your location, we recommend that you select. 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. Note that if there is a tie for the minimum value in each column, matlab chooses the. You may receive emails, depending on your notification preferences. Find indices and values of nonzero elements matlab find. To find array elements that meet a condition, use find in conjunction with a relational expression. Finding x value corresponds to a particular y value. Matlab treats the array as a single column vector with each column appended to the bottom of the previous column. Choose a web site to get translated content where available and see local events and offers. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. I dont have the stats toolbox, and ive never seen either of those 2 functions before. Finding nearest value in matlab using min matt gaidica, ph.
For example, findx 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. I have two very large one dimensional arrays, aref which is around 11,000,000 elements and atest which is around 10,000,000 elements. If magnitudes are equal, then min a returns the value with the smallest magnitude and the smallest phase angle. I briefly tried playing around with the delaunayn function, and it seems it wouldnt work if 2 elements in the array were equal. Follow 21 views last 30 days internazionale on 14 feb 20. Matlab in mathematics assignment help, find minimum and maximum for each row, find minimum and maximum for each row to find the maximum or minimum for each row, the dimension of 2 that is how a matlab refers to rows can be identified as the third argument to the max or min function. Given an array of values and a target value, this function returns the nearest index within that array, and the value which is nearest the. Jun 10, 2014 find minimum value greater than zero in the rows. I need to find the index of the closest element in aref for all elements in atest. If magnitudes are equal, then maxa returns the value with the largest magnitude and the largest phase angle. Finding the index value corresponding to a value closest to 0. I got the value using the following code but i have the nan value in pbest in loops it is giving errors.
I am sure this is so simple but i cant work it out. If a is a vector, then min a returns the minimum of a. How do i find the indices of the maximum or minimum. Then enclose three vectors in and that means you just concatenate all three long 1d vectors into one long vector. How do i find the indices of the maximum or minimum value. If a is a multidimensional array, then min a operates along the first array dimension whose size does not equal 1, treating the elements. 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. I need to find out the minimum value of the matrix and the corresponding row and column index. Oct, 2011 i have a matrix with a lot of data, and i want to find the 10 lowest values of a specific collum.
If a is complex, then min a returns the complex number with the smallest magnitude. 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. I am trying to find the min value and index of each group of datapoints in the following matrix using matlab. Some problems require information about the locations of the array elements that meet a condition rather than their actual values. How to get matlab to display the index of the minimum. Efficient method for finding index of closest value in very. Feb 10, 20 i have a matrix a with double class type data. Mar 29, 2011 if b is a matrix i need to find the index of element that is equal to a constant c where the constant c is undoubtedly somewhere in the matrix. I have a matrix, x5 6 9 8 4 y8 7 2 1 9 if i plot this and i need to get position of the x value corresponds to y1, that means in which row the x value 8 is located. Find min value in 4d matrix and index of min value.
The max function can also return the index of the maximum value in the vector. But perhaps you have a figure file and lost the x and y values. A linear index allows use of a single subscript to index into an array, such as ak. 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. Find closest value in array matlab answers matlab central. How to get matlab to display the index of the minimum value. I want to index it so something like row colfindqminq the problem is that this will index all of the 1s. How to find the location of approximately equal value in. If a is complex, then maxa returns the complex number with the largest magnitude.
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