MATLAB Answers

How to use tofloat ?

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Amrinder Brar
Amrinder Brar on 29 Mar 2015
Edited: Stephen Cobeldick on 30 Mar 2015
When I use this code: g=abs(imfilter(tofloat(gray),w));
This error is shown: Undefined function 'tofloat' for input arguments of type 'uint8'.
Then this suggestion appears: Did you mean: >> g=abs(imfilter(float(gray),w));
When I try to apply this, then also there is an error which goes as: Error using float (line 46) The input argument to float was not a supported type. The only recognized strings are 'single' and 'double'. The input type was 'uint8'.


Amrinder Brar
Amrinder Brar on 29 Mar 2015
Can anybody please answer ? I need it ASAP.
Star Strider
Star Strider on 29 Mar 2015
If you want to convert a uint8 variable to double-precision (floating point) variable, use the double function.
Stephen Cobeldick
Stephen Cobeldick on 30 Mar 2015
MATLAB supports two (industry standard) floating point number classes: double and single. The function tofloat is not a standard MATLAB function.

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Answers (1)

Geoff Hayes
Geoff Hayes on 29 Mar 2015
Amrinder - I don't think that tofloat is a built-in function of MATLAB (for the base version or any of its toolboxes). Is your above code copied from a text book that makes use of this function? A similar question has been asked and answered at
If you want to convert your uint8 gray array to floats (or doubles) then consider using the im2double function (provided your version of MATLAB has it).


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