matlab-struct

I have a structure array containing fields as structure arrays of varying length. For example: 's' is a structure 'data' is a field in 's', and also a structure array itself and length(s(n).data) ~= length(s(m).data) I want to preallocate an array that takes a time stamp from every field s.data.timestamp. Is there a way to do this without using a for loop twice? This is what I have so far: % find the total length count=0; for x=1:length(s) count=count+length(s(x).data); end % preallocate timestamp array timestamp=zeros(1,count); % populate timestamp array index=1; for x=1:length(s) for y=1

I have the following struct data = id: [143x1 double] datenum: [143x1 double] Timestamp: {143x1 cell} Min_F1_USA_40__u: [143x1 double] Max_F1_USA_40__u: [143x1 double] Mean_F1_USA_40__u: [143x1 double] Stddev_F1_USA_40__u: [143x1 double] MeanVals_F1_USA_40__u: [143x1 double] a0_F1_USA_40__u: [143x1 double] a1_F1_USA_40__u: [143x1 double] a2_F1_USA_40__u: [143x1 double] a3_F1_USA_40__u: [143x1 double] a4_F1_USA_40__u: [143x1 double] So on, I have more than 50 field in the struct I have other 3 structure with the same structure and I want to merge this struct When I have 3 struct I will get the

I'm interested in the general problem of accessing a field which may be buried an arbitrary number of levels deep in a containing structure. A concrete example using two levels is below. Say I have a structure toplevel , which I define from the MATLAB command line with the following: midlevel.bottomlevel = 'foo'; toplevel.midlevel = midlevel; I can access the midlevel structure by passing the field name as a string, e.g.: fieldnameToAccess = 'midlevel'; value = toplevel.(fieldnameToAccess); but I can't access the bottomlevel structure the same way -- the following is not valid syntax:

I am working with somebody else's code in MATLAB and it looks like he is creating structures, just by using field names without declaring them at all. Is that how it works in MATLAB, you just start using case-insensitive field names of your choice? So, for example, he has something like this: classdef Emitter properties transients=[]; end end ... some other class methods function sound=makeSound() emitterthing.transients.receivedIntensity = 100 emitterthing.transients.frequency = 500 end end In other words, he just starts making up field names and assigning values to them without declaring the