Matching two numbers using only 2 decimal points

Hi,

I have 2 numbers that I want to match in my program and if these don't match I want to receive an error message. The two numbers that I want to match should match only up to the first two decimal points. For example,

A=3.82 and B=3.829 should match since 3.82 is common. On the other hand, A=3.82 and B=3.8 don't match .How can I match A and B?

Answer 1

[Chandra Kurniawan]

A = 3.82; 
B = 3.829;
C = 3.82; 
D = 3.8;

Astr = num2str(A);
Bstr = num2str(B);
Astr = Astr(strfind(Astr,'.'):end);
Bstr = Bstr(strfind(Bstr,'.'):end);
if length(Astr) < 3,  Astr = strcat(Astr,'0');  end
if length(Bstr ) < 3,  Bstr = strcat(Bstr,'0');  end
strcmp(Astr(1:3),Bstr(1:3))

Answer 2

[Robert Cumming]

compare = @(n1,n2,n_dcp) round(n1*10^n_dcp)==round(n2*10^n_dcp);
>> compare(1.23,1.234,2)
ans =
   1
>> compare(1.23,1.2,2)
ans =
   0

[Anu]

'compare' function requires one of the following Toolbox:

1. System Identification Toolbox

2. Model Predictive Control Toolbox

3. Predictive Maintenance Toolbox

Is there any alternative method