Category: Create 3d matrix from 2d matlab

Create 3d matrix from 2d matlab

Documentation Help Center. X is a matrix where each row is a copy of xand Y is a matrix where each column is a copy of y. The grid represented by the coordinates X and Y has length y rows and length x columns. The grid represented by XYand Z has size length y -by- length x -by- length z. Create 2-D grid coordinates with x -coordinates defined by the vector x and y -coordinates defined by the vector y. Create a 2-D grid with uniformly spaced x -coordinates and y -coordinates in the interval [-2,2].

Starting in Rb, it is not always necessary to create the grid before operating over it. For example, computing the expression x e - x 2 - y 2 implicitly expands the vectors x and y. For more information on implicit expansion, see Array vs. Matrix Operations. Determine the size of the grid. The three coordinate vectors have different lengths, forming a rectangular box of grid points. Use the single-input syntax to generate a uniformly spaced 3-D grid based on the coordinates defined in x.

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The new grid forms a cube of grid points. Data Types: single double int8 int16 int32 int64 uint8 uint16 uint32 uint For additional information on creating multidimensional grids, see Grid Representation. A modified version of this example exists on your system.

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Create an image stack (3-D matrix)

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Toggle Main Navigation. Search Support Support MathWorks. Search MathWorks. Off-Canvas Navigation Menu Toggle. Examples collapse all 2-D Grid. Open Live Script. Plot Surface. Input Arguments collapse all x — x-coordinates of points vector. Output Arguments collapse all X — x-coordinates over grid 2-D or 3-D array. Y — y-coordinates over grid 2-D or 3-D array. Z — z-coordinates over grid 3-D array. Tips For additional information on creating multidimensional grids, see Grid Representation.

Usage notes and limitations: The inputs must be floating-point double or single. No, overwrite the modified version Yes. Select a Web Site Choose a web site to get translated content where available and see local events and offers.Sign in to comment.

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How to create a 3D matrix using the 2D matrices. Vote 0. Answered: Souarv De on 20 Feb Accepted Answer: Fangjun Jiang. Hello All.

create 3d matrix from 2d matlab

I have 72 matrices of size x each. So i want to store these matrices in a 3D matrix with third dimension as index of each x matrix which makes a 3D matrix of size xx So guys do help me in sorting this out.

Cancel Copy to Clipboard. Accepted Answer. Fangjun Jiang on 9 Sep Vote 2.Sign in to comment. Sign in to answer this question. Unable to complete the action because of changes made to the page.

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create 3d matrix from 2d matlab

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You may receive emails, depending on your notification preferences. How to create a 3D matrix using the 2D matrices. Vote 0.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I want to rotate this matrix around its center column to produce a 3D matrix representing an object with a cylindrical symmetry.

The same thing I want to do with a different matrix, which is symmetric with respect to its center row. This time I want to rotate it around its center row to produce the 3D matrix.

How to create a 2D image by rotating 1D vector of numbers around its center element? I just modified the accepted answer to 3D:. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Ask Question. Asked 2 years, 11 months ago. Active 2 years, 11 months ago. Viewed times. What I had in mind is to generalize to 3D the idea given in the link: How to create a 2D image by rotating 1D vector of numbers around its center element?

Can someone help please?

create 3d matrix from 2d matlab

Active Oldest Votes. Thank you for your answer! I wanted to ask if there is a way of solving the problem with interp1 and without using interp2? Sorry for my nagging, but a loop will take too long for a large matrix. Is there another option? Thank you for your help! Thank you very much! One more thing: unfortunately, I haven't manage to translate the code for rotation around the center row for the other matrix, which has symmetry around the center row and not center column.

Can you please help me with that too? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.Sign in to comment. Sign in to answer this question. Unable to complete the action because of changes made to the page.

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You may receive emails, depending on your notification preferences. How to create 3d matrix from the 2d matrix? Lola SE on 12 Sep Vote 0. Hi all.

Accepted Answer. KSSV on 12 Sep Cancel Copy to Clipboard. It should show values, if the dimensions are obeyed More Answers 0. See Also. Tags matrix for loop. Opportunities for recent engineering grads. Apply Today.

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You may receive emails, depending on your notification preferences. How to: taking out 2d matrix from 3d matrix. Vote 0. Commented: adi kul on 19 May Accepted Answer: Guillaume.

Hello All, I need help in 3d matrix. I have z as 2x20x30 matrix which I will represnt here as:. Now I want to take out z1 as m,n and z2 as m,n matrix from this. What I did is:.Documentation Help Center. In a matrix, the two dimensions are represented by rows and columns. Each element is defined by two subscripts, the row index and the column index. Multidimensional arrays are an extension of 2-D matrices and use additional subscripts for indexing. A 3-D array, for example, uses three subscripts.

The first two are just like a matrix, but the third dimension represents pages or sheets of elements. You can create a multidimensional array by creating a 2-D matrix first, and then extending it. For example, first define a 3-by-3 matrix as the first page in a 3-D array. Now add a second page. To do this, assign another 3-by-3 matrix to the index value 2 in the third dimension. The syntax A :,:,2 uses a colon in the first and second dimensions to include all rows and all columns from the right-hand side of the assignment.

The cat function can be a useful tool for building multidimensional arrays. For example, create a new 3-D array B by concatenating A with a third page. The first argument indicates which dimension to concatenate along. Another way to quickly expand a multidimensional array is by assigning a single element to an entire page. For example, add a fourth page to B that contains all zeros.

To access elements in a multidimensional array, use integer subscripts just as you would for vectors and matrices. For example, find the 1,2,2 element of Awhich is in the first row, second column, and second page of A. Use the index vector [1 3] in the second dimension to access only the first and last columns of each page of A.

To find the second and third rows of each page, use the colon operator to create your index vector. Elements of multidimensional arrays can be moved around in many ways, similar to vectors and matrices. Consider a 3-D array with two pages. Reshaping a multidimensional array can be useful for performing certain operations or visualizing the data.

Use the reshape function to rearrange the elements of the 3-D array into a 6-by-5 matrix. Permutations are used to rearrange the order of the dimensions of an array. Consider a 3-D array M. Use the permute function to interchange row and column subscripts on each page by specifying the order of dimensions in the second argument.

create 3d matrix from 2d matlab

The original rows of M are now columns, and the columns are now rows. When working with multidimensional arrays, you might encounter one that has an unnecessary dimension of length 1. The squeeze function performs another type of manipulation that eliminates dimensions of length 1.

For example, use the repmat function to create a 2-bybyby-4 array whose elements are each 5, and whose third dimension has length 1. Use the squeeze function to remove the third dimension, resulting in a 3-D array. A modified version of this example exists on your system. Do you want to open this version instead?

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