如何select数组结构中的一些数据

Question

我在 MATLAB 环境中工作，我有一些像这样的结构：

>> HTC_01

HTC_01 = 

    Name: 'HTC_One_M8-2015-02-11-15-40-30'
    Date: '2015-02-11'
    Time: [395768x1 double]
      Ax: [395768x1 double]
      Ay: [395768x1 double]
      Az: [395768x1 double]
     Lat: [395768x1 double]
     Lon: [395768x1 double]
     Quo: [395768x1 double]
     Vel: [395768x1 double]

现在，我想要 select 来自所有数组的一些数据，例如 (4646:279745)，并将输出放入一个与该数组同名的新数组中。

我想获得：

>> HTC_02 = my_resize(HTC_01, 4646, 279745)

HTC_02 = 

    Name: 'HTC_One_M8-2015-02-11-15-40-30'
    Date: '2015-02-11'
    Time: [275100x1 double]
      Ax: [275100x1 double]
      Ay: [275100x1 double]
      Az: [275100x1 double]
     Lat: [275100x1 double]
     Lon: [275100x1 double]
     Quo: [275100x1 double]
     Vel: [275100x1 double]

问题是：我必须一个数组一个数组地做，还是有更短的方法？

在我看来，仅调整数组的大小在 MATLAB 中非常简单，因此必须存在一种无需创建函数即可完成此操作的简便方法。

Answer 1

这将是一种方法 -

index_range = 4646:279745                       %// index range
flds = {'Ax','Ay','Az','Lat','Lon','Quo','Vel'} %// fields to be selected
fnames = fieldnames(HTC_01)                     %// all fieldnames

%// Logical array with length as number of fields
%// and ones where the fields to be selected appear
idx = ismember(fnames,flds) 

C = struct2cell(HTC_01) %// Get all of the data into a cell array
out1 = reshape([C{idx}],[],sum(idx)).'          %//'#select fields
out2 = out1(:,index_range)                      %//  select data from range
cell_out = mat2cell(out2,ones(1,size(out2,1)),size(out2,2))

%// Store truncated data into numeric fields and then save back as struct
C(idx) = cell_out
out = cell2struct(C,fnames,1)

Answer 2

仅适用于结构中的数组字段：

fields = fieldnames(HTC);
i = 1;

for x = 1:length(fields)
    field = fields{x};
    data = getfield(HTC,field);
    if isa(data,'double')
        output(:,i) = data(4646:279745);
        i = i + 1;
    end
end

所需的每个数据数组范围都保存为输出数组中的一列。

在您更新后更新：

function output = my_resize(input,r1,r2)

fields = fieldnames(input);
output = input;

for x = 1:length(fields)
    field = fields{x};
    data = getfield(input,field);
    if isa(data,'double')
        output = setfield(output,field,data(r1:r2,1));
    end
end

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