how to horizontally concatenate two strings, being one a cell array and the other a num2str converted gpuarray?
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Hello there, I am trying to concatenate two strings, but I'm missing something. The idea is to get these strings:
'CELL:0.1,CELLA:0.2,CHAR:0.3,GCH4:0.4,GH2:0.5'
'CELL:0.1,CELLA:0.3,CHAR:0.5,GCH4:0.7,GH2:0.9'
but my output is:
composition =
CELL:,CELLA:,CHAR:,GCH4:,GH2:0.1 0.2 0.3 0.4 0.5
composition =
CELL:,CELLA:,CHAR:,GCH4:,GH2:0.1 0.3 0.5 0.7 0.9
My code is below. Any help will be much appreciated. Thank you!
A1 = 0.1:0.1:0.5;
A2 = 0.1:0.2:1;
A1 = gpuArray(A1);
A2 = gpuArray(A2);
A = [A1;A2];
C = ['CELL:',',CELLA:',',CHAR:',',GCH4:',',GH2:'];
for i = 1:2
sp = sprintf('%s',C);
y_sp = sprintf('%s',num2str(A(i,:)));
composition = strcat(sp,y_sp);
display(composition);
end
0 Kommentare
Akzeptierte Antwort
Isabel
am 24 Aug. 2017
2 Kommentare
Stephen23
am 24 Aug. 2017
Bearbeitet: Stephen23
am 24 Aug. 2017
You could very easily make your code adjust automatically for different sizes of A and C, and to automatically generate the sprint format string as well:
A = [0.1:0.1:0.5;0.1:0.2:1]
C = {'CELL','CELLA','CHAR','GCH4','GH2'};
%
fmt = sprintf(',%s:%%.4f',C{:});
fmt = fmt(2:end);
N = size(A,1);
Z = cell(N,1);
for k = 1:N
Z{k} = sprintf(fmt,A(k,:));
end
Note how I preallocated the output cell array, which for a small array like this might not be strictly necessary, but is a good habit to learn.
Weitere Antworten (2)
Adam
am 21 Aug. 2017
Bearbeitet: Adam
am 21 Aug. 2017
If you define C as a cell array instead then, for example, this should work:
C = { 'CELL:',',CELLA:',',CHAR:',',GCH4:',',GH2:' }
cell2mat( reshape( [C; arrayfun( @num2str, A1, 'UniformOutput', false )], [1 10] ) )
In a char array all your components just get merged into one long char that is much more complicated to extract the components from to concatenate each one with an element of A1
11 Kommentare
José-Luis
am 22 Aug. 2017
That is fair enough. I like Matlab myself: Wouldn't be answering here otherwise.
If you want down to the metal performance, then it might not be the best choice. Because of this, C++ is my language of choice these days when I ---really--- need fast. Cost is also a problem: since University days, I haven't had an employer willing to shell out for all the toolboxes it'd be neat to have.
That's why, based on the kind of problem they have, I keep recommending people to look in other places as there are better (and possibly free) tools out there.
That being said, I do agree with you: slow code will be slow, be it in assembly or Matlab.
Andrei Bobrov
am 21 Aug. 2017
C = { 'CELL:','CELLA:','CHAR:','GCH4:','GH2:' }
S = string(C) + [.1:.1:.5;.1:.2:.9]
out = join(S,',');
2 Kommentare
Walter Roberson
am 21 Aug. 2017
The above requires R2016b or later.
With R2017a or later, the above could also be coded as
C = [ "CELL:", "CELLA:", "CHAR:", "GCH4:','GH2:" ];
S = C + [.1:.1:.5;.1:.2:.9]
out = join(S,',');
Unfortunately both version of this will fail when the numeric array is a gpuArray :(
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