11. Write 80387 ALP to obtain: i) Mean ii) Variance iii) Standard Deviation Also plot the histogram for the data set.

section .data

msg1 db 10,13,’mean is:  ‘
msg1len equ $- msg1

msg2 db 10,13, ‘std deviation is:’
msg2len equ $- msg2

msg3 db 10,13, ‘variance is:’
msg3len equ $- msg3

data dd 9.0,1.0
datacnt dw 02
hdec dq 100

decpt db ‘.’

section .bss

res rest 01
mean resd 01
var resd 01
dispbuff resb 01

%macro disp 2
    mov eax,04
    mov ebx,01
    mov ecx,%1
    mov edx,%2
    int 80h
%endmacro
%macro accept 2
    mov eax,03
    mov ebx,00
    mov ecx,%1
    mov edx,%2
    int 80h
%endmacro

section .text
global _start
_start:

disp msg1,msg1len

       finit
    fldz
    mov rbx,data
    mov rsi,00
    xor rcx,rcx
    mov cx,[datacnt]

bk:    fadd dword [rbx+rsi*4]
    inc rsi
    loop bk

    fidiv word[datacnt]
    fst dword[mean]

    call dispres

    MOV RCX,00
    MOV CX,[datacnt]
    MOV RBX,data
    MOV RSI,00
    FLDZ
up1:    FLDZ
    FLD DWORD[RBX+RSI*4]
    FSUB DWORD[mean]
    FST ST1
    FMUL
    FADD
    INC RSI
    LOOP up1
    FIDIV word[datacnt]
    FST dWORD[var]
    FSQRT

    disp msg2,msg2len
    CALL dispres

    FLD dWORD[var]
    disp msg3,msg3len
    CALL dispres


exit:     mov eax,01
    mov ebx,00
    int 80h

disp8_proc:
    mov rdi,dispbuff
    mov rcx,02
back:    rol bl,04
    mov dl,bl
    and dl,0FH
    cmp dl,09
    jbe next1
    add dl,07H
next1:  add dl,30H
    mov [rdi],dl
    inc rdi
    loop back
    ret

dispres:
    fimul dword[hdec]
    fbstp tword[res]
    xor rcx,rcx
    mov rcx,09H
    mov rsi,res+9
up2:    push rcx
    push rsi
    mov bl,[rsi]
    call disp8_proc
    disp dispbuff,2 
    pop rsi
    dec rsi
    pop rcx
    loop up2
    disp decpt,1

    mov bl,[res]
    call disp8_proc
    disp dispbuff,2 
    ret

OUTPUT:
swlab@swlab-H81-M1:~$ nasm -f elf64 mean.asm
swlab@swlab-H81-M1:~$ ld -o mean mean.o
swlab@swlab-H81-M1:~$ ./mean

mean is:  000000000000000005.00
std deviation is:000000000000000004.00
variance is:000000000000000016.00

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