How to write tiff stacks with single precision

I have two tiff stack images('a.tif' and 'b.tif'). Each of them have 2 stacks(512*512, grayscale). I want to write the result of a./b in single mode precision with Tiff class. I can get the result (result.zip) with other ImageJ, but failed to do it in Matlab. How can I do this?

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/7184-how-can-i-write-32-bit-floating-point-tifs-with-nans

[Yuanzhen Suo]

Thanks. It works well. Since I want to put multiple images into a tiff file, I also call the writeDirectory after performing t.write.