Append elements to matrix in Matlab -


i want make matrix this:

n rows x 2 columns  22.3 18.3 22.4 18.4 22.5 18.3 22.4 18.3 22.2 18.6

in case have 5 rows 2 columns

but need append new row dynamically, removing first based in given window want.

e.g. have window of n elements in row, when append new row in matrix, must remove first one.

in above example, window of 5 rows: if need input (append) new row: 22.8 17.1 row become this:

22.3 18.3 22.4 18.4 22.5 18.3 22.4 18.3 22.2 18.6 22.8 17.1

there 6 rows, need remove first one. after row becomes (5 rows):

22.4 18.4 22.5 18.3 22.4 18.3 22.2 18.6 22.8 17.1

my question: - how append new row in matlab? - how remove new row in matlab?

i saw in matlab it's possible handle matrix vectors , cells.

e.g achieved want doing that:

messagearr = []; messagearr{end+1} = 23.01 messagearr{end+1} = 23.02 messagearr = messagearr.';%'// messagearr{end+1} = 23.03 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr{end+1} = 23.04 messagearr2 = []; messagearr2{end+1} = 17.01 messagearr2{end+1} = 17.02 messagearr2{end+1} = 17.03 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2{end+1} = 17.04 messagearr2 = messagearr2.'%'// y = horzcat(messagearr, messagearr2) y = cell2mat(y)

it gave me 13x2 double matrix:

23,0100000000000    17,0100000000000 23,0200000000000    17,0200000000000 23,0300000000000    17,0300000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000 23,0400000000000    17,0400000000000

but think not right way it. need more simple way append, , remove first row without necessity of concate cells , doing transpose of cells.

this code append new row , remove first row:

% create 5 rows of two-column data d=[22.3 18.3; 22.4 18.4; 22.5 18.3; 22.4 18.3; 22.2 18.6] % new row of data newrow = [22.8 17.1] % drop first row , append new data @ end d = [d(2:end,:); newrow]

it uses [ ] concatentation operator.


Comments

Post a Comment

Popular posts from this blog

authentication - Mongodb revoke acccess to connect test database -

i have ec2 instance mongodb 3.2.0 installed. have user admin access. can connect user , perform operation remotely. 1 can connect database test remote if knows ip mongo 11.11.11.11. although not able make operations, want restrict access user credentials can connect server. first need create users , grant roles users, example: use admin db.createuser( { user: "myuseradmin", pwd: "abc123", roles: [ { role: "useradminanydatabase", db: "admin" } ] } ) then need start server --auth parameter mongod --auth more information here
Read more

r - Update two sets of radiobuttons reactively - shiny -

i have read ( how make choices in radiobuttons reactive in shiny? ) shows me how update radiobutton s in reactive way. however, when try , update 2 sets of buttons same data, 1 set renders. example: server: # create example data wafer <- rep(c(1:3), each=3) length <- c(1,1,2,1,1,1,3,5,1) width <- c(3,1,6,1,1,1,1,1,6) dd <- data.frame(wafer, length, width) shinyserver(function(input, output, session){ # create reactive dataframe store data values <- reactivevalues() values$df <- data.frame() # lengths , widths of wafer user input <- eventreactive(input$do, { subset(dd, wafer %in% input$wafer, select = length:width) }) # update reactive data frame lengths , widths have been selected user input observe({ if(!is.null(a())) { values$df <- rbind(isolate(values$df), a()) } }) output$wl <- renderdatatable({ a() }) # update radio buttons unique length , widths stored in values$df # ever "observe" put first in co...
Read more

ios - Realm over CoreData should I use NSFetchedResultController or a Dictionary? -

i'm working on app using core data , nsfetchedresultcontroller many reasons switch use realm. saw there "realm version" of nsfetchedresultcontroller on github wouldn't compatible current code using core data. the view controller displaying list of people same school, address book. list sublist of people studied in same city. so thinking make 1 unique request database retrieve list of people , filter locally list within 1 dictionary per school [string: anyobject] string section name within tableview , anyobject array of people. first solution, make nsfetchedresultcontroller each school predicate filtering location. delete actions etc.. handled delegates -> not compatible realm create dictionaries , update them each actions... -> works realm it's annoying code. any better solution? edit: i need clarify request: i'd write class inherit uitableviewcontroller. this class has list of people sorted in alphabetical order the tableview has ...
Read more