Append a char vector to a subset of cells (whose indices are known) in cell array of character vectors

2 次查看(过去 30 天)
Hello MATLAB community:
I am trying to determine the most effective way of going about the following task. I have a cell array of character vectors: mycell = {'cal_start', 't_001', 't_002', ..., 't_200', 'cal_end', 'exp_start', 't_001', 't_02' ,..., 't_048', 'exp_end'};
I have defined the relevant indices from this cell array, the contents of which I would like to append a character vector. In fact there are two index ranges I have defined, and these index ranges indentify the cells between 'cal_start" and 'cal_end', and 'exp_start' and 'exp_end'.
For example:
% regarding the below, for context, 't' is trial, 'cal' is calibration,
% and 'exp' is experiment.
mycell = {'cal_start', 't_001', 't_002', 't_003', 't004', 'cal_end', 'exp_start',...
't_001', 't_002', 'exp_end'};
a = find(contains(mycell, 'cal'));
% i.e., a = [1,6]
b = find(contains(mycell, 'exp'));
% i.e., b = [7,10]
% define trial indices comprising the calibration phase
calidx_rng = a(1)+1 : a(2)-1;
% define trial indices comprising the experiment phase
expidx_rng = b(1)+1 : b(2)-1;
Now, for the charcater vectors of mycell contained in calidx_rng, I want to append 'cal_' at the beginning of each, such that you now have:
mycell = {'cal_start', 'cal_t_001', 'cal_t_002', cal_t_003', cal_t_004', 'cal_end', 'exp_start', 't_001', 't_002', 'exp_end'}
And, similarly, I want to perform the "same" operation, but appending 'exp_' to mycell(expidx_rng) so that the final product is:
mycell = {'cal_start', 'cal_t_001', 'cal_t_002', cal_t_003', cal_t_004', 'cal_end', 'exp_start', 'exp_t_001', 'exp_t_002', 'exp_end'};
Sorry, there was a premature submission when I was adding tags, to finish my post, this is what I have attempted (though here I am continuing in the context of the simplified example above):
mynewcell = append('cal_', mycell(calidx_rng));
MATLAB gives ther error:
Wrong number of input arguments for obsolete matrix-based syntax.
My suspicion is that the best way to approach this is using the cellfun or arrayfun functions, but I must admit, the examples provided in the documentation don't give me a clear picture as to how I should use them in my case.
This is probably a stupid question, but thanks for your time.

采纳的回答

Stephen23
Stephen23 2019-6-30
编辑:Stephen23 2019-6-30
Your basic concept is correct, you just need to use indexing on the LHS as well as the RHS:
mycell(calidx_rng) = strcat('cal_', mycell(calidx_rng));
mycell(expidx_rng) = strcat('exp_', mycell(expidx_rng));
% ^^^^^^^^^^^^ you need this!
Giving:
>> mycell{:}
ans = cal_start
ans = cal_t_001
ans = cal_t_002
ans = cal_t_003
ans = cal_t004
ans = cal_end
ans = exp_start
ans = exp_t_001
ans = exp_t_002
ans = exp_end

更多回答(1 个)

Raymond MacNeil
Raymond MacNeil 2019-6-30
Alright, this was easily achieved with the following (continuing from the example given abvove):
mynewcell = strcat('cal_'), mycell(calidx_rng));
mynewcell = strcat('exp_'), mycell(expidx_rng));
Hope this of help, Ray!
  1 个评论
Raymond MacNeil
Raymond MacNeil 2019-6-30
No, this actually isn't working, as the output gives a truncated array equivalent in length to the index range defined by calidx_rng. You may have concatenate two cell arrays after applying strcat "separately" to 'mycell'. Will explore further and get back to you.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Operators and Elementary Operations 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by