Choosing decimal places by user input.

Question

Stephanie Velasco 2016-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/311873-choosing-decimal-places-by-user-input

评论： the cyclist 2016-11-13

I was trying to write a code where I can ask the user to choose the number of decimal he/she wants to use when calculating the min or max of vector. But I am really stuck

I was trying to do what below but it doesn't work.

decimal = input('Type the number of decimals places to show in output:');
vector = [23 28 4.29 40.2 8]; 
min_ = min(Vector);
fprintf('\nMininum: %0.(%0.f)f',min_,decimal);

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Answer 1

Walter Roberson 2016-11-13

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decimal = input('Type the number of decimals places to show in output:');
vector = [23 28 4.29 40.2 8]; 
min_ = min(Vector);
fprintf('\nMininum: %0.*f', decimal, min_);

The * in the format signals that the number of decimal places should be extracted from the parameters.

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the cyclist 2016-11-13

Nice. Was unaware of that functionality (and missed it when I scanned the documentation).

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Answer 2

the cyclist 2016-11-12

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I don't know if you can get the formatSpec itself as an input, so instead you can embed the formatSpec as a separate call to sprintf:

decimal = input('Type the number of decimals places to show in output:');
vector = [23 28 4.29 40.2 8]; 
min_ = min(vector);
fprintf(['\nMininum: %0.',sprintf('%d',decimal),'f\n'],min_);