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help about fprintf ( 'x = % f / n', x)

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Nikola
Nikola on 22 Dec 2014
Answered: Nikola on 23 Dec 2014
I dont understand meaning of (x = %f/n',x), Whats point/meaning in x = %f in help i can only find that /n represent new line, but whats x=%f for?

Accepted Answer

dpb
dpb on 22 Dec 2014
Try setting
x=pi;
and then the above line at the command line and see...
Also, under the doc for formatting strings under the formatspec link is the following section towards the end --
"The string can also include combinations of the following: ..."
Read that portion carefully.

More Answers (2)

Image Analyst
Image Analyst on 22 Dec 2014
The "x = " just gets prints as-is. It's nothing special and any characters like that, that aren't preceded with a \ or a % just go down exactly as you put them. The % means it's going to replace that part of the string with a variable. The f means a floating point variable. An s means a string, and a d means an integer. So %f means it's going to replace the %f with the value of x, out to 6 or 7 decimal places, because x is the variable that shows up after the 'x = %f\n' formatting string. If you wanted a specific number of decimal places you could use %.3f to have 3 decimal places. If you wanted to pad spaces on the right to make the whole field, say, 20 characters wide, then you could use %20.3f which would put 3 decimal places to the right of the decimal point, however many digits it needs to the left of the decimal point, and then pad as many spaces on the left as it takes to make the whole thing 20 characters wide.

Nikola
Nikola on 23 Dec 2014
thank you very much

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