reshape

??? Error using ==> reshape To RESHAPE the number of elements must not change.

Error in ==> sym_rec_img_preprocess at 32 Ibox = reshape(Ibox,[4 ((sizer*sizec)/noimages)]);

Error in ==> sym_rec_main2 at 78 img = sym_rec_img_preprocess(I, sizer, sizec,noimages);

sizer = size3Dr; %32
sizec = size3Dc;

noimages = sizer/6;  

   I = I3Dtotal(:,:,i);
    img = sym_rec_img_preprocess(I, size3Dr, size3Dc, noimages); % line 78

what am i doing wrong?

Answer 1

[Matt Fig]

Go into sym_rec_img_preprocess and put these right before line 32:

size(Ibox)
size(sizer)
size(sizec)
noimages

Then tell us what the output to the command window says.

[stephanie borg]

??? Undefined function or variable 'Ibox'.

Error in ==> sym_rec_main2 at 32

size(Ibox)

[stephanie borg]

This is the whole program so that you understand better

I3D1 = imread('IMG_0001.jpg');

I3D2 = imread('IMG_0002.jpg');

I3D3 = imread('IMG_0003.jpg');

I3D4 = imread('IMG_0004.jpg');

size3Dr = input('Enter number of training sets');

size3Dc = input('Enter number of different symbols');

sizer = size3Dr; %Assuming equal traning sets

sizec = size3Dc;

noimages = sizer/6;

%% Binarization of images of factory m/c symbols

Igray1 = rgb2gray(I3D1);

Ibw3D1 = im2bw(Igray1,graythresh(Igray1));

Igray2 = rgb2gray(I3D2);

Ibw3D2 = im2bw(Igray2,graythresh(Igray2));

Igray3 = rgb2gray(I3D3);

Ibw3D3 = im2bw(Igray3,graythresh(Igray3));

Igray4 = rgb2gray(I3D4);

Ibw3D4 = im2bw(Igray3,graythresh(Igray4));

I3Dtotal(:,:,1) = Ibw3D1;

I3Dtotal(:,:,2) = Ibw3D2;

I3Dtotal(:,:,3) = Ibw3D3;

I3Dtotal(:,:,4) = Ibw3D4;

%% Image Preprocessing

rfactor = 1;

crpval = 0;

for i = 1 : noimages

I = I3Dtotal(:,:,i);

img = sym_rec_img_preprocess(I, size3Dr, size3Dc, noimages);

for cnt = 1:((size3Dr*size3Dc)/noimages)

bw2 = img_crop(img{cnt}, rfactor, crpval);

charvec = img_resize(not(bw2));

out3D(:,cnt,i) = charvec;

end

end

[Matt Fig]

Which program? I asked you to put those lines in sym_rec_img_preprocess.

[stephanie borg]

this is the original one. i did put those and the output was

??? Undefined function or variable 'Ibox'.

Error in ==> sym_rec_main2 at 32

size(Ibox)

[Matt Fig]

No, you put those lines in sym_rec_main2. Put them in this file:

sym_rec_img_preprocess

Type this at the command line:

edit sym_rec_img_preprocess

now put those lines I showed you right before line 32.

[stephanie borg]

ok i did but it still gives me this error

??? Error using ==> reshape

To RESHAPE the number of elements must not change.

Error in ==> sym_rec_img_preprocess at 36

Ibox = reshape(Ibox,[4 ((sizer*sizec)/noimages)]);

Error in ==> sym_rec_main2 at 79

img = sym_rec_img_preprocess(I, size3Dr, size3Dc, noimages);

[Matt Fig]

O.k., but if you recall, I wanted you to tell the output of those 4 lines, not the error message! What is the output to the command window of those 4 lines?

[stephanie borg]

aa ok sorry its just giving 24 10 24 10 24 10 , the values which i entered for training sets and different symbols respsectively

[Matt Fig]

Please format that so I can read it. Is it

24 10

24 10

24

10

or what? There should be four outputs.

[stephanie borg]

excuse me i was seeing the command history instead. sorry im not so keen in matlab. so the results in the command window are like this

1 244

1 1

1 1

4

thanks for your help

[Matt Fig]

Great! No it is my turn to admit a mistake :-(. I gave you the wrong lines... it should be:

size(Ibox)

sizer

sizec

noimages

We'll eventually get to the bottom of this! Try those and tell what they say. Sorry about that....

[stephanie borg]

it's ok, so now the results are these

ans =

1 244

sizer =

24

sizec =

10

noimages =

4

[Matt Fig]

Good. So we see the code is trying to reshape a size 1-by-244 (244 elements) array to be size 4-by-60 (240 elements).

So taking a guess, I am going to say that line should be:

Ibox = reshape(Ibox,[4 ((sizer*sizec)/noimages)+1]);

Give that a try (comment out the original and put that line in). It is only a guess, and may not work for other values. You will have to play around and see...

[stephanie borg]

ok i did and it gives me this error

Error in ==> sym_rec_img_preprocess at

39

Ic = reshape(Ic,[2((sizer*sizec)/noimages)]);

currently it's like this

Ic = [Iprops.Centroid];

Ic = reshape(Ic,[2 ((sizer*sizec)/noimages)]);

Ic = Ic';

Ic(:,3) = (mean(Ic.^2,2)).^(1/2);

Ic(:,4) = 1:((sizer*sizec)/noimages);

[Matt Fig]

Ah, so now there is another error! So we made it past the first one, now on the the second error. Here is my recommendation at this point. Do what you did before, looking at the sizes of the input arguments to RESHAPE, and try to figure out what is wrong. I.e., now look at"

size(Ic)

Then figure out what is wrong here:

[2 ((sizer*sizec)/noimages)]

there might be a simple off by one error here too.

[stephanie borg]

but it's still giving me error about the previous one

??? Error using ==> reshape

To RESHAPE the number of elements must

not change.

Error in ==> sym_rec_img_preprocess at

33

Ibox = reshape(Ibox,[4((sizer*sizec)/noimages)+1]);

Error in ==> sym_rec_main2 at 79

img = sym_rec_img_preprocess(I,size3Dr, size3Dc, noimages);

Sorry to disturb you but i can't seem to make this program work :(

[Matt Fig]

Now I am confused. First you said that you changed the code and got a new error on line 39. The old error was on line 32. So if the old error was still an error, how did the program get to line 39? The old error shouldn't be anymore if the numbers you told me are true. For example try this at the command line:

Ibox = rand(1,244); % A random array of the correct size.

sizer = 24;

sizec = 10;

noimages = 4;

reshape(Ibox,[4 ((sizer*sizec)/noimages)+1]); % No Error!!!

[stephanie borg]

actually it's doing this:

if i leave Ic = reshape(Ic,[2 ((sizer*sizec)/noimages)]);

the error is

Error in ==> sym_rec_img_preprocess at 37

Ic = reshape(Ic,[2 ((sizer*sizec)/noimages)]);

when i did Ic = reshape(Ic,[2 ((sizer*sizec)/noimages)+1]);

it went back to line 32.

[Matt Fig]

Then I would guess that changing the Ic line allows the calling program (sym_rec_main2) to execute correctly for one value of input arguments, but the next call is what errors. This is what I eluded to earlier when I said that the fix might not cover all usages. I cannot offer more help without actually looking at all of the codes...

The best I can tell you is to look at your inputs each time and try to figure out the fix that covers all cases.

[stephanie borg]

i sent you a personal msg...did you receive it?

[Matt Fig]

No, I didn't. Did you use the interface that comes up when you click my name? (Contact Matt Fig)

Answer 2

[Laura Proctor]

In the code sym_rec_img_preprocess, you are trying to use RESHAPE to reshape the variable Ibox to a size that is incompatible with the original size of Ibox. Try putting in a breakpoint on line 32 of sym_rec_img_preprocess and determine the size of Ibox as well as the size of (sizer*sizec)/noimages, you will see that:

4*(sizer*sizec)/noimages ~= numel(Ibox)

Answer 3

[stephanie borg]

yes that 's what i did. is it possible if i send you the program? becaus I can't seem to do it write. When I eliminate all the errors it start again from the first one!

[Matt Fig]

I sent you a message with my email in it. Did you get it? I used the Contact Stephanie link on your Answers page. If you didn't get it, did you use a valid email when signing up for your MathWorks account?

[seyed hosein alhoseiny]

hi this error: reshape To RESHAPE the number of elements must not change dont Appear in MATLAB VER 2018a

but this error I see in MATLAB2016b

[madhan ravi]

Instead of asking in an 8 year old thread respond to your question.