Format Number (exponential notation)

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Matteo Peruzzi
Matteo Peruzzi 2020-3-23
评论： Matteo Peruzzi 2020-3-23
I have a code and a result is the variabile: T= 5.6789e-05
I want use a function for change the exponential notation from e-05 to e-6 and print the value in a graph.
Correct value T= 56.789e-06
Help me
sprintf('time T= %3.3e\n',T)

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回答（1 个）

Walter Roberson
Walter Roberson 2020-3-23
You will not be able to do this directly. sprintf and related do not offer any control over where the decimal is put.
You can use log10 to probe the power of 10 for the value, such as -5. Divide by that power minus 1 to get a value with two leading decimals. Format that. Add on sprintf('e%d') the power minus 1
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Walter Roberson
Walter Roberson 2020-3-23
X=5.6789e-05;
D=floor(log10(5.6789e-05))-1;
t2S = sprintf('time to half time t2=%.4fe%d', X/10^D, D) ;
and use the variable in constructing the legend.
Matteo Peruzzi
Matteo Peruzzi 2020-3-23
I have change anything.....and work fine ;)
GOOD!!! Really thankyou
Now Italy is not a good place. 6000 dead in two weeks. Take care and rest at home.

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