How to make a recursive call to a function using output values stored in a array?
显示 更早的评论
I have a matlab code for mobius function which gives output for the entered single n value. Now, I want make these functions to be called again for array of numbers to make further operations. Here is my code
function mobius (n)
n=input('Enter n');
j=0;
p = factor(n);
N = hist([0 p],max(p)+1);
r = sum(N(2:end) > 1);
disp('The mobius value of'), disp(n), disp('is');
if (n == 1)
u = 1;
elseif (r > 0)
u = 0;
else
k = sum(N(2:end) > 0);
u = (-1)^k;
end
a=[ 4 5 6 8 20];
x=mobius(a(i))+mobius(a(j));
disp(x);
end
采纳的回答
Voss
2021-12-19
I know you're asking about a recursive call, but I don't think you need a recursive call here because the u calculated one time through the function is correct for the input n. It sounds like you mean you want to call this function multiple times for different n's stored in an array. To do that, you just have to return a value from the function and move the calling of the function out of the function definition (because, again, no recusion is necessary):
function u = mobius (n) % return u
if ~nargin % only prompt the user for n if it wasn't already given
n=input('Enter n');
end
% j=0;
p = factor(n);
N = hist([0 p],max(p)+1);
r = sum(N(2:end) > 1);
disp('The mobius value of'), disp(n), disp('is');
if (n == 1)
u = 1;
elseif (r > 0)
u = 0;
else
k = sum(N(2:end) > 0);
u = (-1)^k;
end
% a=[ 4 5 6 8 20];
% x=mobius(a(i))+mobius(a(j));
% disp(x);
end
So then, somewhere else (e.g., from the command line or in a different function or in a script), you call the function:
a=[ 4 5 6 8 20];
for i = 1:numel(a)
x=mobius(a(i));
disp(x);
end
6 个评论
Stephen23
2021-12-20
Shanmugavelan S's incorrectly posted "Answer" moved here:
Thanks for your help. using your comments I compiled it again. But the following error shows in command window. Please help me to get out of this.
function u = mobius (n) % return u
if ~nargin % only prompt the user for n if it wasn't already given
n=input('Enter n');
end
p = factor(n);
N = hist([0 p],max(p)+1);
r = sum(N(2:end) > 1);
disp('The mobius value of'), disp(n), disp('is');
if (n == 1)
u = 1;
elseif (r > 0)
u = 0;
else
k = sum(N(2:end) > 0);
u = (-1)^k;
end
a=[ 4 5 6 8 20];
for i = 1:numel(a)
x=mobius(a(i));
disp(x);
end
Command window
Enter n
9
The mobius value of
9
is
Unrecognized function or variable 'mobius'.
Error in mob1 (line 22)
x=mobius(a(i));
Voss
2021-12-20
Notice where my function ends, and notice that I said "somewhere else (e.g., from the command line or in a different function or in a script), you call the function."
What I mean is, you have to move the last part of the code where you call the function out of the function to somewhere else; it is not intended to be a recursive function, as I said from the start.
This part, move it out:
a=[ 4 5 6 8 20];
for i = 1:numel(a)
x=mobius(a(i));
disp(x);
end
And if your function is called mob1, call mob1 instead of mobius here.
Shanmugavelan S
2021-12-20
Voss
2021-12-20
Yes, another m-file, or just run from the command line.
Shanmugavelan S
2021-12-20
Stephen23
2021-12-20
"needs to be complied in another m. file"
MATLAB is (from a user perspective) an interpreted language, it is not compiled.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 File Operations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
