How to generate names?
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I want to make my code shorter.
I have this code:
Sheetname1=txt1{1,3};
Sheetname2=txt2{1,3};
Sheetname3=txt3{1,3};
Sheetname4=txt4{1,3};
Sheetname5=txt5{1,3};
Sheetname6=txt6{1,3};
instead there should be a for loop
for i=1:6
Sheetname'write i'=txt'write i'{1,3};
end
how to :) ?
1 个评论
Hassan F
2013-1-8
Is there a specific reason why you implemented your script this way? Such a for loop will be slow and hard to read later on.
回答（5 个）
Walter Roberson
2013-1-8
2 个投票
1 个评论
Jan
2013-1-8
Hassan F
2013-1-8
You can use eval
for i=1:6
eval(['Sheetname' num2str(i) '=txt' num2str(i) '{1,3};'])
end
5 个评论
Walter Roberson
2013-1-8
... but it is not advised.
Hassan F
2013-1-8
Well yes, this is slow and hard to read. But for creating just a handful of variables it shouldn't matter.
No, it's still not advised because
- You're introducing variables non-explicitly into the workspace (so-called poofing). This creates hazards discussed here.
- Enumerating variables through their names makes them hard to index later
The better thing to do here would be
for i=1:6
Sheetname{i} = eval(['txt' num2str(i) '{1,3};'])
end
I do think that it matters. Programmers get used to use methods they are used to use. The more EVAL you write, the more acceptable does this command look, because we are human.
Much better in theory, practice and from the viewpoint of training the brain to think in efficient ways:
Sheetname{1} = txt{1,3};
Sheetname{2} = txt{2,3};
Sheetname{3} = txt{3,3};
Sheetname{4} = txt{4,3};
Sheetname{5} = txt{5,3};
Sheetname{6} = txt{6,3};
Never include an index in the name of a variable. You would not include your current weight to your name also, because the inconveniences are obviously.
Kind regards, Jan70.6kg
Hassan F
2013-1-8
Totally makes sense.
Hassan74.0kg
Hello kity
2013-1-8
1 个评论
See my answer http://www.mathworks.se/matlabcentral/answers/58253#answer_70475, but you should avoid this solution and use cells or other classes which suits your data the most.
Azzi Abdelmalek
2013-1-8
A=cell(1,6);
for ii=1:6
A{ii}=sprintf('Sheetname%d' , ii)
end
Image Analyst
2013-1-8
0 个投票
My m-files are usually 2-3 thousand lines long. I never worry about saving a paltry 3 lines. Why do you care? If you want to use fewer variables, say use a cell array for Sheetname instead of 6 variables, then you could do that, but with only 6 variable, it's really no big deal. Now if you had dozens or hundred variables named like that (which we see sometimes).....then yes, you'd want an array, but I'm not going to ding you for only 6 uniquely named variables.
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2013-1-8
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