Asked by Sam Thorpe
on 10 Mar 2019

Hi. I have defined the following function which I wish to call in a script:

function imageprocess=imselect(x);%function to select same image from each group

imagescontg=zeros(1,10);

imagescontr=zeros(1,10);

imagestreatg=zeros(1,10);

imagestreatr=zeros(1,10);

for n=x:size(imagescontg,2)

imagecontg{1,n}=imread(sprintf('group1 g%2d.jpg',n)); %selects green image (n) from list

imagecontr{2,n}=imread(sprintf('group1 r%2d.jpg',n)); %selects red image (n) from list

a=rgb2gray(imagecontg{1,n}); %convert green image to greyscale

b=rgb2gray(imagecontr{2,n}); %convert red image to greyscale

imshowpair(a,b,'montage');%compare images to one another and plot

totintcontg(n)=sum(sum(a)); %equation to find the total intensity value of the green image

totintcontr(n)=sum(sum(b)); %equation to find the total intensity value of the red image

imagetreat{1,n}=imread(sprintf('group4 g%2d.jpg',n)); %selects green image (n) from list

imagetreat{2,n}=imread(sprintf('group4 r%2d.jpg',n)); %selects red image (n) from list

c=rgb2gray(imagetreat{1,n}); %convert green image to greyscale

d=rgb2gray(imagetreat{2,n}); %convert red image to greyscale

imshowpair(c,d,'montage');%compare images to one another and plot

totinttreatg(n)=sum(sum(c)); %equation to find the total intensity value of the green image

totinttreatr(n)=sum(sum(d)); %equation to find the total intensity value of the red image

end

end

what I am having trouble with is matlab allowing me to call the function. So I would define the first value as x=1 and then get the results from the function so I could process them further in the script. e.g.

startvalue = x

x=1

function imageprocess=imselect(x);%function to select same image from each group

imagescontg=zeros(1,10);

imagescontr=zeros(1,10);

imagestreatg=zeros(1,10);

imagestreatr=zeros(1,10);

for n=x:size(imagescontg,2)

imagecontg{1,n}=imread(sprintf('group1 g%2d.jpg',n)); %selects green image (n) from list

imagecontr{2,n}=imread(sprintf('group1 r%2d.jpg',n)); %selects red image (n) from list

a=rgb2gray(imagecontg{1,n}); %convert green image to greyscale

b=rgb2gray(imagecontr{2,n}); %convert red image to greyscale

imshowpair(a,b,'montage');%compare images to one another and plot

totintcontg(n)=sum(sum(a)); %equation to find the total intensity value of the green image

totintcontr(n)=sum(sum(b)); %equation to find the total intensity value of the red image

imagetreat{1,n}=imread(sprintf('group4 g%2d.jpg',n)); %selects green image (n) from list

imagetreat{2,n}=imread(sprintf('group4 r%2d.jpg',n)); %selects red image (n) from list

c=rgb2gray(imagetreat{1,n}); %convert green image to greyscale

d=rgb2gray(imagetreat{2,n}); %convert red image to greyscale

imshowpair(c,d,'montage');%compare images to one another and plot

totinttreatg(n)=sum(sum(c)); %equation to find the total intensity value of the green image

totinttreatr(n)=sum(sum(d)); %equation to find the total intensity value of the red image

end

end

% further processing in the script

Controlledgroupresults = [totintcontg; totintcontr]'

Treatmentgroupratioresults = [totinttreatg; totinttreatr]'

Controlledratio=[totintcontg./totintcontr]'

Treatmentration=[totinttreatg./totinttreatr]'

[h,p]=ttest(Controlledratio,Treatmentration)

Does anyone have any ideas?

thanks

Answer by KALYAN ACHARJYA
on 10 Mar 2019

Edited by KALYAN ACHARJYA
on 10 Mar 2019

Accepted Answer

Is there any issue to call the function.

Look, suppose you have the following function

function imageprocess=imselect(x);

%do something

end

%save it in different matlab file name as imselect

Now call the function in main script

x=.. % define the value

y=imselect(x);

Here imageprocess output as y.

In your second code, why you are defining the function code again, not required.

Sam Thorpe
on 10 Mar 2019

Thanks Kalyan. I only placed the code there again as an example of what I wanted to do. It turns out there was a conflict in the file names which prevented it from running which I have sorted. My problem now is, that I am getting the current error message.

Output argument "imageprocess" (and maybe others)

not assigned during call to "myfun2".

Error in project (line 2)

y=myfun2(x)

The code works if I run it as seperate function, but has issue with it in a script. Any ideas?

KALYAN ACHARJYA
on 10 Mar 2019

Have you tried this one, after define x= some value (say 1) in main script, not in function code?

y=imselect(x)

Sam Thorpe
on 12 Mar 2019

Thank you Kalyan. I have managed to get it to work. I'm still getting used to the matlab structure.

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