How to solve "Not enough input arguments."

Question

Dimitra 2023-5-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1958674-how-to-solve-not-enough-input-arguments

回答： Jon 2023-5-8

function pinaka = pendatiagonal(e,c,d,a,b)

pinaka = pendatiagonal(e,c,d,a,b)

n = 7;

e = [0 0 round(10*rand(1,n-2))+1];

c = [0 round(10*rand(1,n-1))+1];

d = round(10*rand(1,n))+1;

a = [round(10*rand(1,n-1))+1 0];

b = [round(10*rand(1,n-2))+1 0 0];

e = e(3:end);

c = c(2:end);

a = a(1:end-1);

b = b(1:end-2);

diag(e,-2) + diag(c,-1) + diag(d,0) + diag(a,1) + diag(b,2);

disp(pinaka)

end

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Jon 2023-5-5

It isn't clear at all what you are doing here.

It looks like you start out defining a function call pendatiagonal, but then in the next line you call it, then you start assigning the input variable you would need for calling this function. What exactly are you trying to do, please explain further.

Torsten 2023-5-5

@Dimitra comment moved here:

Hi,

i try to make a pendatiagonal matrix, which has zeros in all columns except the main diagonal and the 2 lines above and below it. The problem is that, when i run it , it says that

"Not enough input arguments."

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Answer 1

cdawg 2023-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/1958674-how-to-solve-not-enough-input-arguments#answer_1229984

在 MATLAB Online 中打开

you're creating e, c, d, a, and b within the function.. it looks like n could be the only input. is this what you're trying to do?

n = 7;
pinaka = pendatiagonal(n)
pinaka = 7×7
     9     2     1     0     0     0     0
     7     7     4     3     0     0     0
     9     8     3     5     6     0     0
     0     8    10     5    10     9     0
     0     0     3     5     3     9     3
     0     0     0     1     6     9     4
     0     0     0     0     3     1    10
function pinaka = pendatiagonal(n)
e = [0 0 round(10*rand(1,n-2))+1];
c = [0 round(10*rand(1,n-1))+1];
d = round(10*rand(1,n))+1;
a = [round(10*rand(1,n-1))+1 0];
b = [round(10*rand(1,n-2))+1 0 0];
e = e(3:end);
c = c(2:end);
a = a(1:end-1);
b = b(1:end-2);
pinaka = diag(e,-2) + diag(c,-1) + diag(d,0) + diag(a,1)  + diag(b,2);
end

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Answer 2

Jon 2023-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/1958674-how-to-solve-not-enough-input-arguments#answer_1231099

在 MATLAB Online 中打开

You could also do it all with a very simple loop

pentadiagonal(7)
ans = 7×7
     1     3     6     0     0     0     0
     6     2     7     8     0     0     0
     7     3     5     1     4     0     0
     0     4     8     6     3     2     0
     0     0     4     9     8     7     3
     0     0     0    10     6     6     4
     0     0     0     0     7     9     1
function pinaka = pentadiagonal(n)
pinaka = zeros(n,n); 
    for k = -2:2
        pinaka = pinaka + diag(randi(10,n-abs(k),1),k);
    end
end