iam unable to call function in for loop?

Question

barath V 2020-2-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503965-iam-unable-to-call-function-in-for-loop

评论： barath V 2020-2-6

采纳的回答： Shunichi Kusano

在 MATLAB Online 中打开

this is the error iam getting

Error using imread>parse_inputs (line 502)

The file name or URL argument must be a character vector or string scalar.

Error in imread (line 342)

[source, fmt_s, extraArgs, was_cached_fmt_used] = parse_inputs(cached_fmt, varargin{:});

Error in bodekkealgo>bodekke (line 14)

im = double(imread(image))

clc;
clear all;
D = 'C:\Users\PRL\Desktop\barathfocus\for-matlab-testonly';
S = dir(fullfile(D,'*.tif')); % pattern to match filenames.
for k = 1:numel(S)
    F = fullfile(D,S(k).name);
    I = double(imread(F));
    a = bodekke(I);                                                                                       
    
end
function[addition] = bodekke(image)
im = double(imread(image))
bd = [-1 0 1]
cbd = conv2(im,bd)
squaredcbd = cbd.^2
addition = sum(squaredcbd(:))
imshow(cbd)
end
        

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Bhaskar R 2020-2-6

在 MATLAB Online 中打开

a = bodekke(F);

barath V 2020-2-6

编辑：barath V 2020-2-6

yes,is working thanks bhaskar.

but i dont understand why it works.

i have passed the image to variable I.

and i call the function with image I it should work.

why it is working if i call by using its name

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Answer 1

Shunichi Kusano 2020-2-6

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503965-iam-unable-to-call-function-in-for-loop#answer_414063

The argument for imread must be file location. "image" in the function is an array.

HTH

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Stephen23 2020-2-6

编辑：Stephen23 2020-2-6

"and i call the function with image I it should work."

Not according to the imread documentation, which states that imread requires a filename as its first input argument. In your function bodekke you call imread, but in your original code what is its input argument? (hint: an image array, and not a filename as it requires).

"why it is working if i call by using address"

Because imread requires a filename as its first input argument.

It appears that you are getting confused by the fact that you have called imread twice, once outside the function (correctly with a filename) and once inside the function (incorrectly with a numeric array). You can either call imread outside the function (and pass an image array) or inside the function (and pass the filename), but doing both makes no sense.

barath V 2020-2-6