Convert Cell to variable name array

2019 5 17
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回答已采纳
更新时间：2019 5 19
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0 个投票

How can i use cell text as variable name input?
I want to use string variables "A" as variable name to output"B".
A={'sample1' 'sample 2' 'sample3'}
like this:
[B]=[sample1, sample2, sample3]
please suggest code made for 2013 matlab version.
Thanks for your help!

6 个评论
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Stephen23
Stephen23 2019-5-17
编辑：Stephen23 2019-5-17
This is not valid MATLAB syntax:
B=(sample1,sample2, sample3)
What are you actually trying to do?
Note that using numbered variables is a sign that you are doing something wrong.
joms
joms 2019-5-17
编辑：joms 2019-5-17
sample1=rand(3);
sample2=rand(3);
sample3=rand(3);
This is correc syntax (B is an array)
[B]=[sample1, sample2, sample3]
madhan ravi
madhan ravi 2019-5-17
编辑：madhan ravi 2019-5-17
That is obviously Python syntax for lists
edit: Looks like you have changed () to [] after I made this comment.
joms
joms 2019-5-17
i edited it please check. Thanks
madhan ravi
madhan ravi 2019-5-17
编辑：madhan ravi 2019-5-17
The creation of those matrices are not a good idea , if the sizes are consitent use a ND array else use a cell array as is, what your doing is risky and vulnerable. Don't believe see the valuable contributions
https://in.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
joms
joms 2019-5-17
my code is just simple label order changer not be used for future troubleshooting. there are 100 plus variables so i need it even it work inefficiently

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madhan ravi
madhan ravi 2019-5-17

0 个投票

A={'sample1' 'sample2' 'sample3'} ;
a = array2table(rand(3)); % an example
a.Properties.VariableNames=A

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madhan ravi
madhan ravi 2019-5-17
Or simply:
B=array2table(rand(3),...
'VariableNames',A)
joms
joms 2019-5-17
编辑：joms 2019-5-17
thanks for the answer but i dont need "a" value in my code. I just want a dynamically changing variable name based on its string order inside a parenthesis() for my code to work
B=(sample1,sample2, sample3)
madhan ravi
madhan ravi 2019-5-17
Now that's a bad approach why do you need that to do ? as Stephen mentioned in the comment above.
joms
joms 2019-5-17
编辑：joms 2019-5-17
I have a list of variable from seperate excel file. The order of the list is changed sometime via user. From the order the m file will find matching label name in seperate excel file and output the column under it.
I have the rest of the code but the conversion of cell array into [sample1,sample2, sample3] i have none
madhan ravi
madhan ravi 2019-5-17
编辑：madhan ravi 2019-5-17
Use readtable() to read the file and match the columns using ismember() in the column subscript of the table.
https://in.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html#bt1552n-1 - see those example to access datas from table also see under Extract Multiple Rows and Multiple Variables for your purpose.
joms
joms 2019-5-17
编辑：joms 2019-5-19
i managed to write a working code out of this
clc
mabiki=0.8
sample1=[1 2 3 6 7]';
sample2=[nan nan]';
sample3=[4 nan nan 4]';
sample4=[nan nan nan]';
patie2 = padcat(sample1,sample2,sample3,sample4)
[l,w]=size(patie2)
length1=(mabiki*l)-mabiki;
time= (0:mabiki:length1)'
sample1=patie2(:,1)
sample2=patie2(:,2)
sample3=patie2(:,3)
sample4=patie2(:,4)
patie = table(time,sample3,sample4,sample2,sample3);
Fromexcel={'time' 'sample3' 'sample4' 'sample2'};
dataA = patie{1:end,Fromexcel};
matrixfin=array2table(dataA,'VariableNames',Fromexcel)
List=matrixfin.Properties.VariableNames(all(isnan(matrixfin{:,:})))';
if length(List)>=1;
fprintf(' These labels are not found \n');
List=matrixfin.Properties.VariableNames(all(isnan(matrixfin{:,:})))'
end
Stephen23
Stephen23 2019-5-19
Rather than this complex and inflexible code:
sample1=patie2(:,1)
sample2=patie2(:,2)
sample3=patie2(:,3)
sample4=patie2(:,4)
patie = table(time,sample3,sample4,sample2,sample3);
just use array2table. In fact it seems like most of your code could be replaced by array2table and a few table operations.

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