# Issue with using Serialport to take in hex values and plot decimal

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Maria Butt le 15 Avr 2021
Hello!
I am trying to plot values from proteus onto matlab, and my proteus values are shown in hexadecimal. I used hex2dec to help me with converting my signal values but my issue is that it only is looking at the positive values. Is there any way to also look at the negative values as well?
Thanks!
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### Réponses (1)

Shadaab Siddiqie le 29 Avr 2021
From my understanding you want to convert negative hex numbers to decimal, The ability to use these functions on negative numbers is not available in MATLAB.
To work around this issue, use the following code:
ndec2hex.m
function [hexstring]=ndec2hex(x,n)
% x : input decimal number
% n : number of bits to perform 2's complements
% hexstring : hex representation of two's complement of x
x=x + (x<0).*2^n;
hexstring=dec2hex(x, ceil(n/4));
nhex2dec.m
function [x]=nhex2dec(hexstring,n)
% hexstring : hex representation of two's complement of xmydec=hex2dec(hexstring);
% x : input decimal number
% n : number of bits to perform 2's complements
x = hex2dec(hexstring);
x = x - (x >= 2.^(n-1)).*2.^n;
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