Precision in writetable()
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Is there a way to use writetable() to export using only 2 decimals? To be able to directly export it to an excel file.
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dpb
2020-10-26
4 个投票
Sadly, no. A OutputFormat formatting string or NumericPrecision option is not available.
I presume since a table can contain any data type including cells too many possibilities are opened up that TMW hasn't wanted to venture down that road.
Does seem like worthy of some design consideration for the normal cases, though, granted...
For text files, the numeric format is long g.
7 个评论
madhan ravi
2020-10-26
dpb
2020-10-26
What's the end objective file target and the data?
Perhaps rounding the data in the table first?
Walter Roberson
2020-10-26
varfun() with appropriately selected input variables, with @(v) round(v,2) as the function to be applied.
madhan ravi
2020-10-26
You can do this via
t = table( 1.12345, "test", 123.12345, 12.12, "12test")
t{:,vartype('numeric') } = round( t{:,vartype('numeric')}, 3,'significant')
Tao Wang
2022-3-10
For me , Willingo's answer is still not working.
I tried and it did show numbers with 2 decimals in commond . but if I writetable() to excel, the numbers format is still long.
Also , I tried num2str first ,
num2str(1.345,'%.2')
and u will not only get the data with 2 decimals ,but also a green flag on the top left of the box.
dpb
2022-3-10
Because having rounded the numbers, they still are doubles and will have machine-precision rounding that Excel will try to preserve.
All you can do is format them inside Excel; same way as MATLAB, Excel keeps everything as a double internally; it only changes how they're displayed.
The second route writes the numeric value as text in the cell which is the source of the warning highlight.
There are several user-contributed utilities to allow one to set Excel table properties on the FEX. I believe it was @Image Analyst who wrote and posted a pretty nice starter set of Excel_utils that you may search for here on Answers -- I recall making a couple extensions and adding/posting another feature or two. That's been with the year...just at the moment I've got things in a state it isn't convenient to try to go find, but will try to get back...
更多回答（2 个）
Johannes Kalliauer
2022-7-20
编辑：Johannes Kalliauer
2022-7-20
0 个投票
dlmwrite('yourfile.txt',t{:,:},'\t','precision','%10.2f')
1 个评论
dpb
2022-7-20
Doesn't get OP directly to Excel as per request, though...but correct that it does allow the formatting string.
Christine
2025-2-12
Another workaround might be executing this line for the variables inside the table.
variable = round(variable*100)/100;
2 个评论
Instead of
round(pi*100)/100
use
round(pi,2)
Another I've seen has been
str2double(sprintf('%.2f',pi))
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