wat is function of scale and size?

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Madhava Teja Munagala 2018-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388222-wat-is-function-of-scale-and-size

编辑： Pawel Jastrzebski 2018-3-14

   if size(i,3)>1
    i=rgb2gray(i);
    wat is size(i,3),here i is image and 3 is what

scale=2; if scale>0 here scale gives what

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Answer 1

Pawel Jastrzebski 2018-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/388222-wat-is-function-of-scale-and-size#answer_309987

编辑：Pawel Jastrzebski 2018-3-14

在 MATLAB Online 中打开

size (x,3) calculates the depth of a 3D array.

Function size calculate the dimensions of the array. The additional parameter (1,2,3) tells which size specifically should be calculated.

Consider the examples below and also read on size doc:

% dimensions
x = 5
y = 6
z = 7
% 2D matrix of random values
m2D = rand(x,y)
% 3D matrix of random values
m3D = rand(x,y,z)
% using 'size' on a 2D matrix:
s2D  = size(m2D)    % gives 'x' and 'y' dimensions
s2Dx = size(m2D,1)  % gives 'x' dimension only
s2Dy = size(m2D,2)  % gives 'y' dimension only
s2Dz = size(m2D,3)  % gives 1, as there's no depth
% using 'size' on a 3D matrix:
s3D  = size(m3D)   % gives 'x', 'y' and 'z' dimensions
s3Dx = size(m3D,1) % gives 'x' dimension only
s3Dy = size(m3D,2) % gives 'y' dimension only
s3Dz = size(m3D,3) % gives 'z' dimension only

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Madhava Teja Munagala 2018-3-14

Thank u, wat is the output of these code

Pawel Jastrzebski 2018-3-14

编辑：Pawel Jastrzebski 2018-3-14

在 MATLAB Online 中打开

I don't want to be rude, but can't you run the code yourself to find out the output?

The output is explained in the comments.

>> % dimensions
x = 5
y = 6
z = 7
% 2D matrix of random values
m2D = rand(x,y)
% 3D matrix of random values
m3D = rand(x,y,z)
% using 'size' on a 2D matrix:
s2D  = size(m2D)    % gives 'x' and 'y' dimensions
s2Dx = size(m2D,1)  % gives 'x' dimension only
s2Dy = size(m2D,2)  % gives 'y' dimension only
s2Dz = size(m2D,3)  % gives 1, as there's no depth
% using 'size' on a 3D matrix:
s3D  = size(m3D)   % gives 'x', 'y' and 'z' dimensions
s3Dx = size(m3D,1) % gives 'x' dimension only
s3Dy = size(m3D,2) % gives 'y' dimension only
s3Dz = size(m3D,3) % gives 'z' dimension only
x =
       5
y =
       6
z =
       7
m2D =
      0.1599    0.9759    0.8343    0.9044    0.5714    0.3581
      0.6668    0.0309    0.8136    0.6804    0.9817    0.9869
      0.0179    0.4939    0.6290    0.3788    0.8497    0.0840
      0.1197    0.8627    0.0022    0.6320    0.2834    0.2503
      0.9521    0.2429    0.3797    0.2433    0.6825    0.8113
m3D(:,:,1) =
      0.0844    0.4379    0.9053    0.7831    0.2488    0.9258
      0.5313    0.3504    0.6402    0.6857    0.3193    0.1788
      0.8006    0.4785    0.1629    0.4662    0.9108    0.5175
      0.7388    0.5874    0.5659    0.2603    0.8852    0.6270
      0.1417    0.1458    0.9316    0.5693    0.7946    0.9132
m3D(:,:,2) =
      0.6640    0.0850    0.3801    0.3781    0.6853    0.2602
      0.3892    0.9224    0.8128    0.2489    0.6203    0.8775
      0.7400    0.0536    0.2441    0.2529    0.7467    0.8061
      0.8176    0.5270    0.8844    0.7672    0.9773    0.4611
      0.6003    0.1189    0.7126    0.0499    0.3839    0.0910
m3D(:,:,3) =
      0.5643    0.7267    0.0525    0.9084    0.8506    0.5173
      0.1874    0.5158    0.8012    0.5100    0.1445    0.9905
      0.5317    0.7906    0.6786    0.6149    0.3705    0.2265
      0.3550    0.2045    0.9460    0.3161    0.6224    0.3980
      0.3148    0.6781    0.0916    0.0775    0.9976    0.6966
m3D(:,:,4) =
      0.0646    0.3191    0.7346    0.4968    0.4658    0.2886
      0.7477    0.9861    0.6373    0.0224    0.5609    0.2690
      0.4204    0.7182    0.0738    0.0538    0.4945    0.5942
      0.8113    0.4132    0.1205    0.1409    0.0678    0.4759
      0.3796    0.0986    0.9816    0.8935    0.8976    0.3683
m3D(:,:,5) =
      0.6556    0.4391    0.5199    0.5669    0.0478    0.9374
      0.9382    0.0273    0.0538    0.6804    0.7383    0.5134
      0.6204    0.8762    0.8622    0.3714    0.0380    0.2409
      0.2828    0.6101    0.4429    0.0782    0.9542    0.2600
      0.2052    0.2036    0.5480    0.4564    0.7424    0.7590
m3D(:,:,6) =
      0.9933    0.4306    0.6401    0.3081    0.7598    0.4369
      0.3567    0.7307    0.1320    0.4024    0.2909    0.3043
      0.7529    0.2612    0.4528    0.8842    0.2774    0.2909
      0.1100    0.0948    0.6522    0.7006    0.0061    0.2425
      0.5970    0.4510    0.8270    0.2419    0.3747    0.9367
m3D(:,:,7) =
      0.8602    0.2698    0.3320    0.5433    0.4825    0.1319
      0.3972    0.9897    0.7487    0.2514    0.4427    0.3559
      0.4794    0.1837    0.6444    0.5786    0.3118    0.3959
      0.5650    0.8617    0.1692    0.9155    0.0553    0.8855
      0.4896    0.0326    0.9522    0.8956    0.7538    0.0212
s2D =
       5     6
s2Dx =
       5
s2Dy =
       6
s2Dz =
       1
s3D =
       5     6     7
s3Dx =
       5
s3Dy =
       6
s3Dz =
       7
>>