Matlab value error while creating vector

I am creating a vector

    dt = 0.1;
    x = 0:dt:10;

and then trying to find the index for

    loc = 4.6;
    j = find(x==loc);

the index should be 47, however I receive

    j = 
      1×0 empty double row vector

Matlab is adding a small value (8.8818e-16) to this value and varying small values to other numbers in the vector, but not all. I can remove the small errors on the numbers through

    x=round(x,3)

but I'm wondering if there is something that needs to be done to prevent this error in the future. I am currently using version 2018a and 2016b, and they both do this.

Thank you

Answer 1

[madhan ravi]

Read https://www.mathworks.com/matlabcentral/answers/428770-why-isn-t-matlab-counting-this-as-equal-to-1#answer_345891

j=find(abs(x-4.6)<1e-5)

[Brandon Graha]

Thank you. I guessed it was a problem with floating numbers.