Why not adding space between words

2020 1 28
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更新时间：2020 1 29
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strcat('Scale Factor = ',num2str(table2array(T(min(find(find_groups==k)),'scalefactor'))))
and the output is like:
'Scale Factor =0.65'
I need to add the space between = and 0.65. Using above code does not add the space. Any idea/solution?

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Guillaume
Guillaume 2020-1-29
Please note in Walter's answer how he simplified the horror that is:
table2array(T(min(find(find_groups==k)),'scalefactor')))
to
T.scalefactor(find(find_groups==k,1)))
Use proper table indexing,
table2array(Atable(rows, 'variablename')) %() indexing on a table returns a table
is simply
Atable.variablename(rows) %. indexing returns the content of the table
%or
Atable{rows, 'variablename'} % {} indexing returns the content of the table
and
min(find(something))
is simply
find(something, 1) %get the first element only

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Image Analyst
Image Analyst 2020-1-29

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Try fprintf()
theNumber = table2array(T(min(find(find_groups==k)),'scalefactor')); % Whatever...but don't use num2str()
fprintf('Scale Factor = %.2f.\n', theNumber);

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Thanks but I dont want to print it. I want to use it as plot x axis title.
Image Analyst
Image Analyst 2020-1-29
theNumber = table2array(T(min(find(find_groups==k)),'scalefactor')); % Whatever...but don't use num2str()
xLabelString = sprintf('Scale Factor = %.2f.\n', theNumber);
xlabel(xLabelString, 'FontSize', 20);
Allen
Allen 2020-1-29
Though sprintf is a much better approach, you can also use [] or horzcat to concatenate pretty much any like class of variables; in this case character vectors.
xLabelString = ['Scale Factor = ',num2str(table2array(T(min(find(find_groups==k)),'scalefactor')))];
Thank you. And if it was string array, how could I add no limitation to the resulting string? for example
xLabelString = sprintf('Name = %.2s', theName);
this line says report the string until two characters. so if the name is "Hello" it would report "He". How can I say to report the whole "Hello" not part of it?
Ps. Hello is an example and the length of name might change in each iteration so I need a general method.
Guillaume
Guillaume 2020-1-29
If you don't put any restriction on the format length, then matlab won't truncate the input. So
sprintf('Name = %s', theName) %no limit to 2 characters
would work.
If you want a minimum field width of 2 characters but more if required, then
sprintf('Name = %2s', theName) %No . in the format string. Minimum field width of 2, padding with spaces if required
Thank you @Image Analyst and @Allen and @Guillaume. If you post separately I can vote for your posts.

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更多回答（2 个）

Walter Roberson
Walter Roberson 2020-1-29

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https://www.mathworks.com/help/matlab/ref/strcat.html
For character array inputs, strcat removes trailing ASCII white-space characters: space, tab, vertical tab, newline, carriage return, and form feed. For cell and string array inputs, strcat does not remove trailing white space.

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so what would you suggest to do?
Walter Roberson
Walter Roberson 2020-1-29
strcat({'Scale Factor = '}, num2str(T.scalefactor(find(find_groups==k,1))))

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Steven Lord
Steven Lord 2020-1-29

1 个投票

If you're using a release that supports string arrays, you can simplify this a bit if you trust MATLAB to do "something reasonable" when combining your text and numeric data.
x = 0.65;
S = "Name = " + x

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