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Assignment has more non-singleton rhs dimensions than non-singleton subscripts, please help

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I am writing a program that finds dark disks in an image then crops that image for a grouping of images.
After everyone's help i got the code to work up to actually saving an image.. heres the code so far
clear all; close all; clc;
%script for running several images through finddisk
path = 'C:\Users\darkloki3\Desktop\Research in Squires Lab\images for multidiskfind\cool frames';
destination= 'C:\Users\darkloki3\Desktop\Research in Squires Lab\images for multidiskfind\cool frames\cropped cool frames';
frames = dir(path);
%creating an array with the names of the image files in the folder
for n= 1:length(frames)
filenumber = int2str(n);%integer to string
while length(filenumber)<5
filenumber=cat(2,'0',filenumber);
end
newfilename(n,:)=[path,filesep,filenumber,'.png'];
end
threshold = 45;
if exist(destination) ~= 7
mkdir(destination)
end
frames;
nu=1;
for i=1:895
finddisk(newfilename(i,:),'png',threshold);
% disk = ans;
% %crop image around disk and save as a new image
imwrite(ans,['C:\Users\darkloki3\Desktop\hopefully cropped',filesep,num2str(nu)],'jpeg')
nu=nu+1;
end
for n= 1:length(frames)
filenumber2 = int2str(n);%integer to string
while length(filenumber2)<5
filenumber2=cat(2,'0',filenumber2);
end
newfilename2(n,:)=[path,filesep,filenumber2,'.png'];
end
for j=1:895
finddiskcenter(newfilename2(j,:),'png',threshold);
matrix=imread(newfilename2(j,:),'png');
x=floor(ans(1,2));
y=floor(ans(1,1));
w=1;
newmatrix=zeros(200);
for i = (y-200):570
z=1;
for j = (x-200):760
newmatrix(w,z) = matrix(i,j);
z=z+1;
end
w=w+1;
end
imwrite(newmatrix,['C:\Users\darkloki3\Desktop\hopefully cropped',filesep,num2str(j)],'png')
end
  3 Commenti
jeremy wright
jeremy wright il 19 Ago 2012
I know everything else pretty much works now because i got no errors when i forgot to put a valid savepath for imwrite

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Risposta accettata

Star Strider
Star Strider il 19 Ago 2012
Modificato: Star Strider il 19 Ago 2012
I suggest changing:
newfilename(n,1)=[path,filesep,filenumber,'.png'];
to:
newfilename(n,:)=[path,filesep,filenumber,'.png'];
( i.e. inserting a colon ‘:’ in place of ‘1’ in the newfilename subscripts ) and see if that works. (It worked for me in a simulation.) If it doesn't, please list the error. This is not an insoluble problem!
  23 Commenti
jeremy wright
jeremy wright il 20 Ago 2012
Modificato: jeremy wright il 20 Ago 2012
i just got it to work, i commented out the "newfilename=zeros"
now i just have to see if i can get the original program to write

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Più risposte (2)

José-Luis
José-Luis il 19 Ago 2012
Modificato: José-Luis il 19 Ago 2012
Hello
In your code
newfilename=char(filename);
is an array of characters, that you then try to assign strings to:
newfilename(n,1)=[path,filesep,filenumber,'.png'];
That's a no-no. I figure that is what's producing the error. If you want to preallocate an array of 10 filenames:
nameArray = cell(10,1);
that you can then populate, e.g.:
nameArray{1} = 'yourString';
and access:
iWantMyStringBack = nameArray{1};
Cheers!
  4 Commenti
jeremy wright
jeremy wright il 19 Ago 2012
Modificato: jeremy wright il 19 Ago 2012
ok i changed it and it still says conversion from cell to char is not possible... hmm i reran and now it says " Attempt to reference field of non-structure array."
jeremy wright
jeremy wright il 19 Ago 2012
Modificato: jeremy wright il 19 Ago 2012
whoops, nevermind about the non structure thing, i accidentally deleted the apostrophes around .png
the very original error message was "Assignment has more non-singleton rhs dimensions than non-singleton subscripts." somehow i forgot to include that in the original question. hope that helps.

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Jan
Jan il 19 Ago 2012
  • Do not shadow the important function path by a local variable.
  • SPRINTF is smarter for adding leading zeros.
  • Use a cell string instead of a CHAR matrix:
folder = 'C:\Users\darkloki3\Desktop\Research in Squires Lab\images for multidiskfind\cool frames';
newfilename = cell(1, length(frames));
for n = 1:length(frames)
filenumber = sprintf('%05d', n);
newfilename{n} = [folder, filesep, filenumber, '.png'];
end
  3 Commenti
Star Strider
Star Strider il 20 Ago 2012
It's one of a number of format specifiers used in fprintf, sprintf, and other I/O functions. Specifically, '%05d' inserts leading zeros in a 5-digit field to return to filenumber a string to use in newfilename. For instance, if:
n = 1
filenumber = '00001'
or if:
n = 32767
filenumber = '32767'
The reason for zero-padding is to be sure all the filenames have the same length (number of characters). That makes them much easier to sort, find, and read later.

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