why does the function in my programming get an error with the description 'Not enough input arguments.'?

why does the function in my programming get an error with the description 'Not enough input arguments.' please explain why this can be an error and how to fix it? I am using matlab R2015a.

function letter = readLetter(snap)

load NewTemplates
snap=imresize(snap,[42 24]);
comp=[ ];
for n=1:length(NewTemplates)
    sem=corr2(NewTemplates{1,n},snap);
    comp=[comp sem];
end
vd=find(comp==max(comp));
if vd==1 || vd==2
    letter='A';
elseif vd==3 || vd==4
    letter='B';
elseif vd==5
    letter='C';
elseif vd==6 || vd==7
    letter='D';
elseif vd==8
    letter='E';
elseif vd==9
    letter='F';
elseif vd==10
    letter='G';
elseif vd==11
    letter='H';
elseif vd==12
    letter='I';
elseif vd==13
    letter='J';
elseif vd==14
    letter='K';
elseif vd==15
    letter='L';
elseif vd==16
    letter='M';
elseif vd==17
    letter='N';
elseif vd==18 || vd==19
    letter='O';
elseif vd==20 || vd==21
    letter='P';
elseif vd==22 || vd==23
    letter='Q';
elseif vd==24 || vd==25
    letter='R';
elseif vd==26
    letter='S';
elseif vd==27
    letter='T';
elseif vd==28
    letter='U';
elseif vd==29
    letter='V';
elseif vd==30
    letter='W';
elseif vd==31
    letter='X';
elseif vd==32
    letter='Y';
elseif vd==33
    letter='Z';
    
elseif vd==34
    letter='1';
elseif vd==35
    letter='2';
elseif vd==36
    letter='3';
elseif vd==37 || vd==38
    letter='4';
elseif vd==39
    letter='5';
elseif vd==40 || vd==41 || vd==42
    letter='6';
elseif vd==43
    letter='7';
elseif vd==44 || vd==45
    letter='8';
elseif vd==46 || vd==47 || vd==48
    letter='9';
else
    letter='0';
end
end

[Torsten]

Did you call the function from a script with an appropriate input for "snap" ? Otherwise: how should the function work without input ?

[Amelinda Callista]

I don't think I have. How to do it? sorry I don't really understand

[Walter Roberson]

Why does everyone use that verbose code??

function letter = readLetter(snap)

load NewTemplates
snap=imresize(snap,[42 24]);
comp=[ ];
for n=1:length(NewTemplates)
    sem=corr2(NewTemplates{1,n},snap);
    comp=[comp sem];
end
vd=find(comp==max(comp));
LETS = 'AABBCDDEFGHIJKLMNOOPPQQRRSTUVWXYZ123445666788999';
if vd <= length(LETS)
    letter = LETS(vd);
else
    letter = '0';
end

[Amelinda Callista]

thank you for your comment

Answer 1

[Sulaymon Eshkabilov]

What Torsten has suggested is somewhat like this one. And addionally, it is better to have two input arguments (to be called, or existing in the workspace), e.g.:

NewTemplates = load('XXXXX.mat');  % mat or ASCII formatted *.dat files can be loaded 
letter = readLetter(snap, NewTemplates);

function letter = readLetter(snap, NewTemplates)
snap=imresize(snap,[42 24]);

...
end

[Amelinda Callista]

in which line should I put the syntax? I have put it in column 1-4 but it got an error in column 3 which is calling the function. error description: 'Function definitions are not permitted in this context.'

[Torsten]

I guess you mean "row" instead of "column" ?

Which MATLAB version do you use ?

https://uk.mathworks.com/matlabcentral/answers/94515-why-do-i-receive-an-error-when-attempting-to-run-my-script

[Walter Roberson]

you are using r2015a. But r2015b was the first release that permitted defining functions inside scripts. You need to put the function in its own file in your release.

[Torsten]

I wonder why the above link is not yet updated (at least said that it's only relevant for releases <= 2015a).

[Amelinda Callista]

what version of matlab should I use so that the function doesn't have problems?

[Stephen23]

"what version of matlab should I use so that the function doesn't have problems?"

MATLAB has supported functions for a very long time (certainly well before your version), so there is nothing stopping you from creating a function in its own file and then calling it, exactly as Walter Roberson commented here.

https://www.mathworks.com/help/matlab/matlab_prog/scripts-and-functions.html

[Amelinda Callista]

okey, thank you for your comment guys <3