How to replace a vector element with a value not equal the other vector values?

I struggling with an assignemt in which i have to find the remaining number in a single sudoku row. I have to replace 0 with a number which doesnt match the current numbers i the row.

my current is:

function sudokuRow = fillSudokuRow(sudokuRow)
sudokuRow(sudokuRow==0)=a;

I can make it replace the 0 with a secpific number but i cant figure out how to make variate numbers depending on the numbers in the suduko row?

Answer 1

[Matt J]

function sudokuRow = fillSudokuRow(sudokuRow)

 idx=(sudokuRow==0);

 sudokuRow(idx)=func(sudokuRow(~idx));

end

[Joakim Mørk]

Thx Matt! allthough it doesnt seem to work. When inserting vector input (sudokuRow) this error accours:

Unrecognized function or variable 'func'.

Error in fillSudokuRow (line 4)
 sudokuRow(idx)=func(sudokuRow(~idx));

[Matt J]

It doesn't recognize the function func(), because you haven't written it yet!

[Joakim Mørk]

Code:

function sudokuRow = fillSudokuRow(sudokuRow)
idx=(sudokuRow==0);
sudokuRow(idx)=func(sudokuRow(~idx));
end

Output:

>> fillSudokuRow([9,4,0,1,5,7,2,3,8])
Unrecognized function or variable 'func'.

Error in fillSudokuRow (line 4)
sudokuRow(idx)=func(sudokuRow(~idx));

[madhan ravi]

You haven’t showed or perhaps not defined the function func() as Matt mentions in his comments.

[Joakim Mørk]

Im sorry very new to this.. How do you do that?

[Matt J]

These pages talk about the syntax for composing functions

https://www.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html

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

[Matt J]

@Joakim,

To be a bit clearer, your question asks about how to extract the non-zeros and do "something" with them, and that's what my answer demonstrates how to do, in the same generality in which your question is phrased. But your post does not say that you see a difficulty even after you have the non-zeros, nor what that difficulty is.

You also seem to think that we can offer more help with no explanation about what func() is required to do. But I don't know why we should know what comes next better than you. Would it be clear to someone familiar with Sudoku? I myself have never played....

[Joakim Mørk]

I see what you mean Matt J. I thought it was clear but i see that my question could go in many directions, im still not to comfortable in how to ask the right questions as i'm not to familiar with the terms within Matlab.

I solved the problem in the end, with great help from you guys. thx.

function sudokuRow = fillSudokuRow(sudokuRow)

idx=(sudokuRow==0);
sudokuRow(idx)=45-(sum(sudokuRow));
end

output:

fillSudokuRow([9,4,0,1,5,7,2,3,8])

ans =

     9     4     6     1     5     7     2     3     8