Array of Matrices in MATLAB

Question

I am looking for a way to store a large variable number of matrixes in an array in MATLAB   Are there any ways to achieve this   Example   for i  1 unknown   myArray i    zeros 500 800   end   Where unknown is the varied length of the array  I can revise with additional info if needed   Update  Performance is the main reason I am trying to accomplish this   I had it before where it would grab the data as a single matrix  show it in real time and then proceed to process the next set of data   I attempted it using multidimensional arrays as suggested below by Rocco  however my data is so large that I ran out of Memory  I might have to look into another alternative for my case   Will update as I attempt other suggestions   Update 2   Thank you all for suggestions  however I should have specified beforehand  precision AND speed are both an integral factor here  I may have to look into going back to my original method before trying 3-d arrays and re-evaluate the method for importing the data

User · Answer

myArrayOfMatrices   zeros unknown 500 800     If you re running out of memory throw more RAM in your system  and make sure you re running a 64 bit OS   Also try reducing your precision  do you really need doubles or can you get by with singles     myArrayOfMatrices   zeros unknown 500 800  single      To append to that array try   myArrayOfMatrices unknown 1        zeros 500 800

User · Answer

I was doing some volume rendering in octave  matlab clone  and building my 3D arrays  ie an array of 2d slices  using  buffer zeros 1 512 512 512  uint16    vol reshape buffer 512 512 512     Memory consumption seemed to be efficient   can t say the same for the subsequent speed of computations

User · Answer

myArrayOfMatrices   zeros unknown 500 800     If you re running out of memory throw more RAM in your system  and make sure you re running a 64 bit OS   Also try reducing your precision  do you really need doubles or can you get by with singles     myArrayOfMatrices   zeros unknown 500 800  single      To append to that array try   myArrayOfMatrices unknown 1        zeros 500 800

User · Answer

if you know what unknown is    you can do something like  myArray   zeros 2 2   for i  1 unknown   myArray   i    zeros x y   end   However it has been a while since I last used matlab  so this page might shed some light on the matter    http   www mathworks com access helpdesk help techdoc index html  access helpdesk help techdoc matlab prog f1-86528 html

User · Answer

if you know what unknown is    you can do something like  myArray   zeros 2 2   for i  1 unknown   myArray   i    zeros x y   end   However it has been a while since I last used matlab  so this page might shed some light on the matter    http   www mathworks com access helpdesk help techdoc index html  access helpdesk help techdoc matlab prog f1-86528 html

User · Answer

If all of the matrices are going to be the same size  i e  500x800   then you can just make a 3D array   nUnknown     The number of unknown arrays myArray   zeros 500 800 nUnknown     To access one array  you would use the following syntax   subMatrix   myArray     3      Gets the third matrix   You can add more matrices to myArray in a couple of ways   myArray   cat 3 myArray zeros 500 800      OR myArray     nUnknown 1    zeros 500 800     If each matrix is not going to be the same size  you would need to use cell arrays like Hosam suggested   EDIT  I missed the part about running out of memory  I m guessing your nUnknown is fairly large  You may have to switch the data type of the matrices  single or even a uintXX type if you are using integers   You can do this in the call to zeros   myArray   zeros 500 800 nUnknown  single

User · Answer

I was doing some volume rendering in octave  matlab clone  and building my 3D arrays  ie an array of 2d slices  using  buffer zeros 1 512 512 512  uint16    vol reshape buffer 512 512 512     Memory consumption seemed to be efficient   can t say the same for the subsequent speed of computations

User · Answer

If all of the matrices are going to be the same size  i e  500x800   then you can just make a 3D array   nUnknown     The number of unknown arrays myArray   zeros 500 800 nUnknown     To access one array  you would use the following syntax   subMatrix   myArray     3      Gets the third matrix   You can add more matrices to myArray in a couple of ways   myArray   cat 3 myArray zeros 500 800      OR myArray     nUnknown 1    zeros 500 800     If each matrix is not going to be the same size  you would need to use cell arrays like Hosam suggested   EDIT  I missed the part about running out of memory  I m guessing your nUnknown is fairly large  You may have to switch the data type of the matrices  single or even a uintXX type if you are using integers   You can do this in the call to zeros   myArray   zeros 500 800 nUnknown  single

User · Answer

Use cell arrays  This has an advantage over 3D arrays in that it does not require a contiguous memory space to store all the matrices  In fact  each matrix can be stored in a different space in memory  which will save you from Out-of-Memory errors if your free memory is fragmented  Here is a sample function to create your matrices in a cell array   function result   createArrays nArrays  arraySize      result   cell 1  nArrays       for i   1   nArrays         result i    zeros arraySize       end end   To use it   myArray   createArrays requiredNumberOfArrays   500 800      And to access your elements   myArray 1  2 3    10    If you can t know the number of matrices in advance  you could simply use MATLAB s dynamic indexing to make the array as large as you need  The performance overhead will be proportional to the size of the cell array  and is not affected by the size of the matrices themselves  For example   myArray 1    zeros 500  800   if twoRequired  myArray 2    zeros 500  800   end

User · Answer

if you know what unknown is    you can do something like  myArray   zeros 2 2   for i  1 unknown   myArray   i    zeros x y   end   However it has been a while since I last used matlab  so this page might shed some light on the matter    http   www mathworks com access helpdesk help techdoc index html  access helpdesk help techdoc matlab prog f1-86528 html

User · Answer

myArrayOfMatrices   zeros unknown 500 800     If you re running out of memory throw more RAM in your system  and make sure you re running a 64 bit OS   Also try reducing your precision  do you really need doubles or can you get by with singles     myArrayOfMatrices   zeros unknown 500 800  single      To append to that array try   myArrayOfMatrices unknown 1        zeros 500 800

User · Answer

If all of the matrices are going to be the same size  i e  500x800   then you can just make a 3D array   nUnknown     The number of unknown arrays myArray   zeros 500 800 nUnknown     To access one array  you would use the following syntax   subMatrix   myArray     3      Gets the third matrix   You can add more matrices to myArray in a couple of ways   myArray   cat 3 myArray zeros 500 800      OR myArray     nUnknown 1    zeros 500 800     If each matrix is not going to be the same size  you would need to use cell arrays like Hosam suggested   EDIT  I missed the part about running out of memory  I m guessing your nUnknown is fairly large  You may have to switch the data type of the matrices  single or even a uintXX type if you are using integers   You can do this in the call to zeros   myArray   zeros 500 800 nUnknown  single

User · Answer

myArrayOfMatrices   zeros unknown 500 800     If you re running out of memory throw more RAM in your system  and make sure you re running a 64 bit OS   Also try reducing your precision  do you really need doubles or can you get by with singles     myArrayOfMatrices   zeros unknown 500 800  single      To append to that array try   myArrayOfMatrices unknown 1        zeros 500 800

User · Answer

just do it like this  x zeros 100 200   for i 1 100   for j 1 200     x i j  input  enter the number      end end

User · Answer

Use cell arrays  This has an advantage over 3D arrays in that it does not require a contiguous memory space to store all the matrices  In fact  each matrix can be stored in a different space in memory  which will save you from Out-of-Memory errors if your free memory is fragmented  Here is a sample function to create your matrices in a cell array   function result   createArrays nArrays  arraySize      result   cell 1  nArrays       for i   1   nArrays         result i    zeros arraySize       end end   To use it   myArray   createArrays requiredNumberOfArrays   500 800      And to access your elements   myArray 1  2 3    10    If you can t know the number of matrices in advance  you could simply use MATLAB s dynamic indexing to make the array as large as you need  The performance overhead will be proportional to the size of the cell array  and is not affected by the size of the matrices themselves  For example   myArray 1    zeros 500  800   if twoRequired  myArray 2    zeros 500  800   end

User · Answer

Use cell arrays  This has an advantage over 3D arrays in that it does not require a contiguous memory space to store all the matrices  In fact  each matrix can be stored in a different space in memory  which will save you from Out-of-Memory errors if your free memory is fragmented  Here is a sample function to create your matrices in a cell array   function result   createArrays nArrays  arraySize      result   cell 1  nArrays       for i   1   nArrays         result i    zeros arraySize       end end   To use it   myArray   createArrays requiredNumberOfArrays   500 800      And to access your elements   myArray 1  2 3    10    If you can t know the number of matrices in advance  you could simply use MATLAB s dynamic indexing to make the array as large as you need  The performance overhead will be proportional to the size of the cell array  and is not affected by the size of the matrices themselves  For example   myArray 1    zeros 500  800   if twoRequired  myArray 2    zeros 500  800   end

User · Answer

if you know what unknown is    you can do something like  myArray   zeros 2 2   for i  1 unknown   myArray   i    zeros x y   end   However it has been a while since I last used matlab  so this page might shed some light on the matter    http   www mathworks com access helpdesk help techdoc index html  access helpdesk help techdoc matlab prog f1-86528 html

User · Answer

If all of the matrices are going to be the same size  i e  500x800   then you can just make a 3D array   nUnknown     The number of unknown arrays myArray   zeros 500 800 nUnknown     To access one array  you would use the following syntax   subMatrix   myArray     3      Gets the third matrix   You can add more matrices to myArray in a couple of ways   myArray   cat 3 myArray zeros 500 800      OR myArray     nUnknown 1    zeros 500 800     If each matrix is not going to be the same size  you would need to use cell arrays like Hosam suggested   EDIT  I missed the part about running out of memory  I m guessing your nUnknown is fairly large  You may have to switch the data type of the matrices  single or even a uintXX type if you are using integers   You can do this in the call to zeros   myArray   zeros 500 800 nUnknown  single

User · Answer

Use cell arrays  This has an advantage over 3D arrays in that it does not require a contiguous memory space to store all the matrices  In fact  each matrix can be stored in a different space in memory  which will save you from Out-of-Memory errors if your free memory is fragmented  Here is a sample function to create your matrices in a cell array   function result   createArrays nArrays  arraySize      result   cell 1  nArrays       for i   1   nArrays         result i    zeros arraySize       end end   To use it   myArray   createArrays requiredNumberOfArrays   500 800      And to access your elements   myArray 1  2 3    10    If you can t know the number of matrices in advance  you could simply use MATLAB s dynamic indexing to make the array as large as you need  The performance overhead will be proportional to the size of the cell array  and is not affected by the size of the matrices themselves  For example   myArray 1    zeros 500  800   if twoRequired  myArray 2    zeros 500  800   end

User · Answer

I was doing some volume rendering in octave  matlab clone  and building my 3D arrays  ie an array of 2d slices  using  buffer zeros 1 512 512 512  uint16    vol reshape buffer 512 512 512     Memory consumption seemed to be efficient   can t say the same for the subsequent speed of computations

User · Answer

just do it like this  x zeros 100 200   for i 1 100   for j 1 200     x i j  input  enter the number      end end

User · Answer

I was doing some volume rendering in octave  matlab clone  and building my 3D arrays  ie an array of 2d slices  using  buffer zeros 1 512 512 512  uint16    vol reshape buffer 512 512 512     Memory consumption seemed to be efficient   can t say the same for the subsequent speed of computations

[arrays] Array of Matrices in MATLAB

Examples related to arrays

Examples related to matlab

Examples related to matrix