Error using ones Size inputs must be integers?

hello every one i have a problem with my code for error

r =[zeros(size(img2,1),size(img2,2)) ones(size(img2,1),size(img2,2)/2)];

where img2 an image of size (111 235)

Error using ones

Size inputs must be integers

and i want to have an image of the same size of img2

Answer 1

[Walter Roberson]

If you want an image the same size as img2 then

r = zeros(size(img2), class(img2));

after which you can assign ones into an appropriate section of r

Your phrase size(img2,2)/2 has a problem when the number of columns in img2 is odd, as it does happen to be. 235/2 is not an integer.

r(round(end/2)+1:end, round(end/2)+1:end) = 1;  %perhaps

[youb mr]

it's work but i want to have an image that the left side a black side and the rhigt side a white side

[Walter Roberson]

r(:, round(end/2)+1:end) = 1;  %perhaps

[youb mr]

Error using round

Not enough input arguments.

[Walter Roberson]

>> img2 = rand([111   235]);
>> r = zeros(size(img2), class(img2));
>> r(:, round(end/2)+1:end) = 1;  %perhaps
>> imshow(r)

Works for me.

What shows up for

which round

[youb mr]

Error using round

Not enough input arguments.

Error in Untitled (line 3)

r(:, round(end/2)+1:end) = 1; %perhaps

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/82999-round-function-fails-when-used-in-subscript-index#answer_92629

suggests that you might be running into bugs with old versions of MATLAB, in the R2011 time frame. Which MATLAB version are you using?

[youb mr]

i use R2018

[Walter Roberson]

r(:, ceil(end/2)+1:end) = 1;  %perhaps

[vishnu vvs]

hi everyone in my code i have an error please help me out

Error using zeros

size inputs must be integers.

error in two _stage _sub

Q_phase = zeros (Nr,1) ;

ERROR IN main_SR

[AP1,DP1,p0] = two_stage_sub(H,K,bit,p);

[Walter Roberson]

You might have computed Nr using floating point arithmetic such as 0.35/0.001. If so... Don't Do That! Floating point computations are only approximate when decimal fractions are used.