can someone help me create this function

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toufik mec
toufik mec 2020-1-5
评论： Walter Roberson 2020-1-6
Can some one create matlab code for this function? I want the answers of f from 0 to 100.
m= 0 to 5.
n= 0 to 5.
r= 0 to 5 (whole numbers only)
There is one condition : m and n and r never equal 0 at the same time. If first and second = 0 the third never equal to 0
  1 个评论
Walter Roberson
Walter Roberson 2020-1-6
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采纳的回答

Image Analyst
Image Analyst 2020-1-5
编辑：Image Analyst 2020-1-5
Did you try the super-obvious brute force method of a triple for loop with an "if" test?
c = 340;
Lx = 7.85;
Ly = 6.25;
h = 4.95;
f = zeros(6, 6, 6);
for m = 0 : 5
for n = 0 : 5
for r = 0 : 5
if m==0 && n==0 && r==0
% Don't allow all 3 to be zero at the same time.
continue;
end
t = sqrt((m/Lx)^2 + (n/Ly)^2 + (r/h)^2);
% Assign t to f if t is in the range 0-100.
if t >= 0 && t <= 100
f(m+1, n+1, r+1) = t;
end
end
end
end
fprintf('Done!\n');
Otherwise you could vectorize it with meshgrid().
1.JPG
  2 个评论
Image Analyst
Image Analyst 2020-1-5
As long as it's not homework (because you can't turn in my work pretending it's your own), you can use this code:
c = 340;
Lx = 7.85;
Ly = 6.25;
h = 4.95;
f = zeros(6*6*6, 4);
row = 1;
for m = 0 : 5
for n = 0 : 5
for r = 0 : 5
temp = (c/2) * sqrt((m/Lx)^2 + (n/Ly)^2 + (r/h)^2);
if m+n+r >= 1 && temp <= 100
f(row, :) = [m, n, r, temp];
row = row + 1;
end
end
end
end
% Crop to only however many we used.
f = f(1:row-1, :);
% Sort on column 4
f = sortrows(f, 4);
% Print out all the rows.
fprintf('m n r f(m,n,r)\n-------------\n');
for row = 1 : size(f, 1)
fprintf('%d %d %d %.1f\n', ...
f(row, 1), f(row, 2), f(row, 3), f(row, 4));
end
fprintf('Done!\n');
It will give the table shown in your image.

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更多回答（2 个）

David Hill
David Hill 2020-1-5
count=0;
for m=0:5
for n=0:5
for r=0:5
if r+m+n==0
break;
end
count=count+1;
f(count)=170*sqrt(m^2/61.6225 + n^2/39.0625 + r^2/24.5025);
end
end
end
end
  1 个评论
toufik mec
toufik mec 2020-1-5
f between 0-100 only how to limit that and if u can give me the answers with table like mentioned above and ty

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David Hill
David Hill 2020-1-5
count=0;
for m=0:5
for n=0:5
for r=0:5
if r+m+n==0
continue;
end
t=170*sqrt(m^2/61.6225 + n^2/39.0625 + r^2/24.5025);
if t >= 0 && t <= 100
count=count+1;
f(count,:)=[m,n,r,t];
end
end
end
end

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