Using nested loops, write a Matlab program that goes through all elements of a matrix (2D array) and replaces every element that is either a multiple of 5 or 7 with -1.

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This is what I have so far...

A=input('enter an array');
num_rows = size(A,1);
num_cols = size(A,2);
for i=1:1:num_rows
for j=1:1:num_cols
if A(i,j)/ 5 or 7 = integer
fprintf('-1')
end
end
end

I'm not sure how to identify the multiples of 5 and 7 and make them replace that with the -1

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Answer 1

Roger Stafford 2018-4-2

在 MATLAB Online 中打开

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Your test on a number x from your array can be:

if round(x/5)==x/5 | round(x/7)==x/7

(Doing fprintf('-1') just prints out "-1" and is totally useless for your purposes.)

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Ciara Gornoski 2018-4-2

编辑：Walter Roberson 2018-4-2

在 MATLAB Online 中打开

I did this and I'm still not getting anything.

A=input('enter an array');
num_rows = size(A,1);
num_cols = size(A,2);
for i=1:1:num_rows
for j=1:1:num_cols
if round(A(i,j)/5)==A(i,j)/5 || round(A(i,j)/7)==A(i,j)/7
   end
end
end

I'm just able to input an array but it doesn't give me an output.

Walter Roberson 2018-4-2

在 MATLAB Online 中打开

if ...
  A(i,j) = -1;

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Using nested loops, write a Matlab program that goes through all elements of a matrix (2D array) and replaces every element that is either a multiple of 5 or 7 with -1.

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Using nested loops, write a Matlab program that goes through all elements of a matrix (2D array) and replaces every element that is either a multiple of 5 or 7 with -1.

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