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concatenate string with array

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Zee
Zee 2022 年 5 月 31 日
コメント済み: dpb 2022 年 6 月 1 日
Hello,
I have the following data which I need to bring to a certain format.
A= [23.5567, 5.34567, 23.1]
B= [-13.5357, 6.254, 2101.2]
C= [4,8,15]
I want to add some string value and certain characters to the above vectors and combine it to get the following format of single column vector:
4-sample1-sample2-(23.56,-13.54)
8-sample1-sample2-(5.35, 6.25)
15-sample1-sample2-(23.10, 2101.20)
Also to get the above format I want to round of A and B vector values to two decimal places but the the earlier Matlab version doesn't have rounding to certain places function.
  2 件のコメント
SALAH ALRABEEI
SALAH ALRABEEI 2022 年 5 月 31 日
For the rounding part,
format short
A= [23.5567, 5.34567, 23.1];
B= [-13.5357, 6.254, 2101.2];
C= [4,8,15];
A=round(A,2)
A = 1×3
23.5600 5.3500 23.1000
B=round(B,2)
B = 1×3
1.0e+03 * -0.0135 0.0063 2.1012
C=round(C,2)
C = 1×3
4 8 15
dpb
dpb 2022 年 5 月 31 日
" the earlier Matlab version doesn't have rounding to certain places function."
As the other responders have shown, you can use the i/o library functions with formatting strings to write to desired precision. If the object is rounding, one can then convert the result back to numeric w/ str2double
num2str has had a precision optional argument "since forever" but it is the total number of significant digits so not quite so helpful here.
I see that the optional argument to round wasn't added until R2014b in the Compatibility notes -- that surprises me to be reminded it's that recent an enhancement.
But, it's easy-peasy to do yourself --
Round=@(x,n)round(x*10^n)/10^n;
>> Round(pi,2)
>> ans =
3.1400
>>

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採用された回答

Voss
Voss 2022 年 5 月 31 日
編集済み: Voss 2022 年 5 月 31 日
A= [23.5567, 5.34567, 23.1];
B= [-13.5357, 6.254, 2101.2];
C= [4,8,15];
One way:
sprintfc('%d-sample1-sample2-(%0.2f,%0.2f)',[C; A; B].')
ans = 3×1 cell array
{'4-sample1-sample2-(23.56,-13.54)' } {'8-sample1-sample2-(5.35,6.25)' } {'15-sample1-sample2-(23.10,2101.20)'}
Another way:
arrayfun(@(a,b,c)sprintf('%d-sample1-sample2-(%0.2f,%0.2f)',c,a,b),A,B,C,'Uniform',false).'
ans = 3×1 cell array
{'4-sample1-sample2-(23.56,-13.54)' } {'8-sample1-sample2-(5.35,6.25)' } {'15-sample1-sample2-(23.10,2101.20)'}
  4 件のコメント
Zee
Zee 2022 年 6 月 1 日
Thank you for explaining. I am just trying to explore different functions and learning from mistakes and troubleshooting at the moment. The second option works and I will read more about this function.
dpb
dpb 2022 年 6 月 1 日
The two return identically the same output; in fact the second is the equivalent of what the internal definition of sprintfc is -- a wrapper that turns the char() array output of sprintf that creates only a single character array for each invocation into a cell array of cellstr() for each element of the arguments passed to sprintf
To see what the difference is, try
sprintf('%d-sample1-sample2-(%0.2f,%0.2f)',C,A,B)
at the command line and see what it returns -- and why the cell array was useful.
Then try
sprintf('%d-sample1-sample2-(%0.2f,%0.2f)\n',C,A,B)
and
whos ans
after each and observe...

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その他の回答 (1 件)

Matt J
Matt J 2022 年 5 月 31 日
A= [23.5567, 5.34567, 23.1];
B= [-13.5357, 6.254, 2101.2];
C= [4,8,15];
formatSpec="%d-sample1-sample2-(%.2f, %.2f)";
str = compose(formatSpec,C',A',B')
str = 3×1 string array
"4-sample1-sample2-(23.56, -13.54)" "8-sample1-sample2-(5.35, 6.25)" "15-sample1-sample2-(23.10, 2101.20)"
  1 件のコメント
Walter Roberson
Walter Roberson 2022 年 5 月 31 日
User is R2011b, string objects and compose() did not exist back then...

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