How can I use a variable for formatting?

2022 4 14
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更新时间：2022 4 14
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Hi.
I have this line of code:
address = num2str(str2double(string(dec2bin(find(strcmp(dictionary,content(1:end-1)))))),'%04d');
It works, but I would like that the 4 is taken from a variable.
In particular, my variable is
numBits = ceil(log2(length(phrases)));
Is there a way to do so? Thanks

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Les Beckham
Les Beckham 2022-4-14
编辑：Les Beckham 2022-4-14
Ran in:

1 个投票

Ran in:
You can also use %*d, like this
for k = 1:5
fprintf('%*d\n', k, 2*k); % the first argument (k) is the field width, 2*k is the value to print
end
2 4 6 8 10
Documentation is here
By the way, why are you converting to string and then to double and then back to a string?

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Star Strider
Star Strider 2022-4-14
I’d forgotten about the variable filed width as an optional argument.
+1
Rosario Frontino
Rosario Frontino 2022-4-14
编辑：Rosario Frontino 2022-4-14
Thanks for your answer, I'm still working on the code so I'll optimize that conversion.
I don't get how to implement your solution on my code since num2str has only two parameters (format being the second) and of course I can't use a third.
Star Strider
Star Strider 2022-4-14
Ran in:
Ran in:
Use sprintf instead of num2str —
for k = 1:5
sprintf('%*d', k, 2*k)
end
ans = '2'
ans = ' 4'
ans = ' 6'
ans = ' 8'
ans = ' 10'
.
Les Beckham
Les Beckham 2022-4-14
编辑：Les Beckham 2022-4-14
You are welcome. @Star Strider is correct, sprintf is the right way to go.
If an answer in the forum solves your problem, it is considered gracious to accept it. If not please add a comment to request additional clarification. Thanks.
Rosario Frontino
Rosario Frontino 2022-4-14
Yeah it works by using sprintf. Thanks you both

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