Need help with Matlab - I get an error

'A Function that takes a number and return it with the desired number of decimal places';

    for i = 0; i < DECIMAL_PLACES;    
        value = round((rawData(r,c)*100)/(100));
    end

[Walter Roberson]

This is not actually possible with binary floating point; decimal numbers are infinite repeating binary expansions, the same way that 1/7th is an infinite repeating expansion in decimal.

Answer 1

[Stephen23]

@Mitch Byatt: you do not need a loop. Don't try to put lots of loops in everything and make code more complicated than it needs to be.

 >> fun = @(val,dp) round(val*10^dp)/10^dp;
 >> fun(0.123456,3)
 ans =
        0.123

Answer 2

[Jan]

You forgot to mention the error message.

The function definition is missing (the line starting with "function"). Perhaps "DECIMAL_PLACES" is undefined.

You run a loop over "i" but use the potentially undefined indices r and c inside the loop.

The round() is misplaced. It should be applied to "rawData*100" only, not to "rawData*100/100" of course.