How can i use round function to change decimal value to integer ?

Hi all!

i used the function "round" in order to round values in matrix, but it does not display the required result.

for example i have

x=1.5919 1.0e+06 *

i used

A=round(x)/(10^6) 

i get this

X=1.5919 ,but the result i want is X=2.

Thanks in advance

Answer 1

[Walter Roberson]

format long g
x = 1.5919 * 1.0e+06

x = 
     1591900

round(x/10^6)

ans = 
     2

If you are wanting to round to 1 significant digit, then it gets a bit more complicated in vectorized form

x = [pi*10^6, exp(1)*10^-5, -sqrt(2)*10^2, -inf, inf, 0, nan].'

x = 7×1

1.0e+00 * 3141592.65358979 2.71828182845904e-05 -141.42135623731 -Inf Inf 0 NaN

scale = 10.^floor(log10(abs(x)));
scale(scale == 0 | ~isfinite(scale)) = 1;
A = round(x ./ scale) .* scale

A = 7×1

1.0e+00 * 3000000 3e-05 -100 -Inf Inf 0 NaN

[Maria]

Super! thank you so much!