Why do I receive the error that arrays have incompatible sizes for this operation?

When the code runs the error message reads:

• Arrays have incompatible sizes for this operation
• Error in line 5
• D=A:(A-C)/B:C;

clear all
A=('initial value:');
B=('number of values:');
C=('final value:');
D=A:(A-C)/B:C;
E=3412.14.*D;
F=(3412.14/2544.5).*D;
G=550.*D;
table(D',E',F',G','VariableNames',{'D','E','F','G'})

[Arif Hoq]

as C is the final value so i guess

D=A:(C-A)/B:C;

[Joshua Lenhardt]

Even with that change I still receive the error about incompatible arrays

[Arif Hoq]

check my answer. you did not specify the function input in your variable A,B,C

[Joshua Lenhardt]

I'm sorry I didn't see that there. Thank you so much for your help and time with this, it finally makes sense for me now.

Answer 1

[Arif Hoq]

try this:

A=input('initial value:');
B=input('number of values:');
C=input('final value:');
% A=2;
% B=10;
% C=20;
D=A:(C-A)/B:C;
E=3412.14.*D;
F=(3412.14/2544.5).*D;
G=550.*D;
table(D',E',F',G','VariableNames',{'D','E','F','G'})

[Arif Hoq]

A=2;
B=10;
C=20;
D=A:(A-C)/B:C;
E=3412.14.*D;
F=(3412.14/2544.5).*D;
G=550.*D;
table(D',E',F',G','VariableNames',{'D','E','F','G'})

ans =

  0×4 empty table

whenever "final value-initial value"

A=2;
B=10;
C=20;
D=A:(C-A)/B:C;
E=3412.14.*D;
F=(3412.14/2544.5).*D;
G=550.*D;
table(D',E',F',G','VariableNames',{'D','E','F','G'})

ans = 11×4 table
     D        E         F         G  
    ____    ______    ______    _____

       2    6824.3     2.682     1100
     3.8     12966    5.0957     2090
     5.6     19108    7.5095     3080
     7.4     25250    9.9233     4070
     9.2     31392    12.337     5060
      11     37534    14.751     6050
    12.8     43675    17.165     7040
    14.6     49817    19.578     8030
    16.4     55959    21.992     9020
    18.2     62101    24.406    10010
      20     68243     26.82    11000

Answer 2

[Voss]

I guess those first three lines are supposed to be calls to input()

A=('initial value:');
B=('number of values:');
C=('final value:');

whos()

  Name      Size            Bytes  Class    Attributes

  A         1x14               28  char               
  B         1x17               34  char               
  C         1x12               24  char               

D=A:(A-C)/B:C;

Arrays have incompatible sizes for this operation.

As in:

A=input('initial value:');
B=input('number of values:');
C=input('final value:');
D=A:(A-C)/B:C;

[Voss]

Also, note that this:

D=A:(C-A)/B:C;

gives you one more element than was requested:

A = 0; % initial value
B = 10; % number of values
C = 1; % final value
D=A:(C-A)/B:C;
numel(D)

ans = 11

It's better to use linspace():

D = linspace(A,C,B);
numel(D)

ans = 10

Answer 3

[DEBABRATA jana]

B=imread('LOGO.bmp');

subplot(2,2,3),imshow(B),title('Watermark Image');

Wd=im2double(B);

DCTw=dct(Wd);

subplot(2,2,4),imshow(DCTw),title('DCT of Watermark Image');

DCTwi=(DCTw/2)+(DCTi/0.001);

WI=idct(DCTwi);

Arrays have incompatible sizes for this operation.

also

Arrays have incompatible sizes for this operation.

Error in DCTandIDCTwithWatermarkImage (line 17)

DCTwi=(DCTw/2)+(DCTi/0.001);

[DGM]

The error means what it says. The arrays are not compatible sizes. So what size are they? Nobody knows what LOGO.bmp is, so nobody knows what size DCTw is. Similarly, nobody knows what size DCTi is or where it came from. You are the only person with access to that information.

Check the sizes of your arrays. If they came from the same source, one may have been subject to some operation (e.g. padding or differencing) which has altered its size.