i have to get similar output as i have uploaded.why my data is getting repeated again and again?

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riki singh 2022-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/1821485-i-have-to-get-similar-output-as-i-have-uploaded-why-my-data-is-getting-repeated-again-and-again

评论： dpb 2022-10-11

T=readtable('input.csv');
th=[0:1:3]';
for i= 1:size(th)
    reph=T{i,end-1};
    imth=T{i,end};
    result(i)=reph+1i*imth;
end
result_data=result';
for j=1:nume1(th)
    result_data2(:,j)=result_data;
end
data1=[th result_data2];
csvwrite('sample.csv',data1);

my same data is getting repeated again and again

I have read input.csv file

and output should be saved in .csv format and it should exactly look similar to file plot.csv ..

2021a version

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Answer 1

David Hill 2022-10-10

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T=readtable('input.csv');
th=[0:1:3]';
result=[th,reshape(T.re+T.im*1i,size(th,1),[])];
csvwrite('sample.csv',result);

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riki singh 2022-10-10

i have all data in form of which is shown in input.csv file

i have to write a code in such a way that my final output looks like plot.csv file.exact replica of that file

dpb 2022-10-10

在 MATLAB Online 中打开

Above does so with the one small task left for you to add the first row into the result cell array before calling writecell.

Only thing I'd suggest to change to generalize would be to replace the hardcoded line

th=[0:1:3]';

with

th=unique(T.Th);

to make the code more general if/when the number of elements in Th changes.

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Answer 2

dpb 2022-10-10

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Carrying on from @David Hill's most excellent start,

tT=readtable(websave('input.csv','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1151360/input.csv'));
u=unique(tT.Th);                    % in case number changes in future, be general
tT.C=complex(tT.re,tT.im);          % convenience of short v name
out=[{'Th'} compose('p=%d',u.')];   % the header row for starters
out=[out;num2cell(u) num2cell(reshape(tT.C,numel(u),[]))]; % finish off the output cell array
writecell(out,'plot.csv')           % and save 
type plot.csv
Th,p=0,p=1,p=2,p=3
0,3.2+8i,5.2+9i,9.2-40i,6.2+7.8i
1,5.2+8.5i,6.2+7i,9.2-9.5i,5.2-6.3i
2,4.2+3.2i,7.2+5i,8.2-9.8i,6.23-4.5i
3,6.2+6.3i,8.2+2i,7.2+9.8i,4.2+4.5i

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dpb 2022-10-11

编辑：dpb 2022-10-11

You want something that works or a klunk?

You can recast it however you want but there's no point in having MATLAB and not use it as it's designed to be used. The name is, after all, "MATrix LABoratory" for a reason.

dpb 2022-10-11

So, if you work thru each line at command line and see what does and refer back to the doc for any function with which you're not familiar, what, specifically do you not understand/don't follow after seeing its result?

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