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Programming in LabVIEW MathScript-An Engineering Cost Analysis Example Using If Statements
Summary: This is an example of using LabVIEW MathScript to solve a simple engineering cost analysis problem in which the cost to assemble a product depends on the cost of its components; the cost of components depends on the number of units to be assembled.
An Engineering Cost Analysis Example
Suppose you are a design engineer for a company that manufactures consumer electronic devices and you are estimating the cost of producing a new product. The product has four components that are purchased from electronic parts suppliers and assembled in your factory. You have received cost information from your suppliers for each of the parts; as is typical in the electronics industry, the cost of a part depends on the number of parts you order from the supplier.
Your assembly cost for each unit include the cost of labor and your assembly plant. You have estimated that these costs are C0=$45.00/unit.
The cost of each part depends on the number of parts purchased; we will use the variable n to represent the number of parts, and the variables CA, CB, CC, and CD to represent the unit cost of each type of part. These cost are given in the following tables.
n |
CA |
|---|---|
| 1-4 | $16.00 |
| 5-24 | $14.00 |
| 25-99 | $12.70 |
| 100 or more | $11.00 |
n |
CB |
|---|---|
| 1-9 | $24.64 |
| 10-49 | $24.32 |
| 50-99 | $24.07 |
| 100 or more | $23.33 |
n |
CC |
|---|---|
| 1-24 | $17.98 |
| 25-49 | $16.78 |
| 50 or more | $15.78 |
n |
CD |
|---|---|
| 1-9 | $12.50 |
| 10-99 | $10.42 |
| 100 or more | $9.62 |
Cunit = C0 + CA + CB + CC + CD. To find the unit cost to build one unit, we look in the above tables with a value of n=1; the unit cost is
$45.00+$16.00+$24.64+$17.98+$12.50 = $116.12To find the unit cost to build 20 units, we look in the above tables with a value of
n=20 and get
$45.00+$14.00+$24.32+$17.98+$10.42 = $109.72As expected, the unit cost for 20 units is lower than the unit cost for one unit.
Exercise 1
Create an if statement that will assign the proper cost to the variable CA based on the value of the variable n.
Solution 1
if n >= 1 && n <= 4
CA = 16.00;
elseif n >= 5 && n <= 24
CA = 14.00;
elseif n >= 25 && n <= 99
CA = 12.70;
else
CA = 11.00;
end
Exercise 2
Create a LABVIEW MATHSCRIPT program that will compute the total unit cost Cunit for a given value of the variable n.
Solution 2
This code by BrieAnne Davis:
if n>=1 && n<=4;%if n=1 to 4, CA is $16.00
CA=16.00;
elseif n>=5 && n<=24;%if n=5 to 24, CA is $14.00
CA=14.00;
elseif n>=25 && n<=99;%if n=25 to 99, CA is $12.70
CA=12.70;
elseif n>=100;%if n=100 or more, CA is $11.00
CA=11.00;
end%this ends the if statement for CA
if n>=1 && n<=9;%if n=1 to 9, CB is $24.64
CB=24.64;
elseif n>=10 && n<=49;%if n=10 to 49, CB is $24.32
CB=24.32;
elseif n>=50 && n<=99;%if n=50 to 99, CB is $24.07
CB=24.07;
elseif n>=100;%if n=100 or more, CB is $23.33
CB=23.33;
end%this ends the if statement for CB
if n>=1 && n<=24;%if n=1 to 24, CC is $17.98
CC=17.98;
elseif n>=25 && n<=49;%if n=25 to 49, CC is $16.78
CC=16.78;
elseif n>=50;%if n=50 or more, CC is $15.78
CC=15.78;
end%this ends the if statement for CC
if n>=1 && n<=9;%if n=1 to 9, CD is $12.50
CD=12.50;
elseif n>=10 && n<=99;%if n=10 to 99, CD is $10.42
CD=10.42;
elseif n>=100;%if n=100 or more, CD is $9.62
CD=9.62;
end%this ends the if statement
CO=45.00;
Cunit=CO + CA + CB + CC + CD;
Exercise 3
Create a LABVIEW MATHSCRIPT program that will compute and plot the total unit cost as a function of n for values of n from 1 to 150.
Solution 3
This code was originally written by Bryson Hinton and then modified:
cunit = zeros(1,150);
c0 = 45;
for n=1:150
%compute price for part A
if n >= 1 && n <= 4
ca=16;
elseif n >= 5 && n <= 24
ca=14;
elseif n >= 25 && n <= 99
ca=12.7;
else
ca=11;
end
%compute price for part B
if n >= 1 && n <= 9
cb=24.64;
elseif n >= 10 && n <= 49
cb=24.32;
elseif n >= 50 && n <= 99
cb=24.07;
else
cb=23.33;
end
%compute price for part C
if n >= 1 && n <= 24
cc=17.98;
elseif n >= 25 && n <= 49
cc=16.78;
else
cc=15.78;
end
%compute price for part D
if n >= 1 && n <= 9
cd=12.50;
elseif n >= 10 && n <= 99
cd=10.42;
else
cd=9.62;
end
%sum cost for all parts
cunit(n)= c0+ca+cb+cc+cd;
end
% Plot cost as a function of n
plot(1:150,cunit);
xlabel('n (units)');
ylabel('cost (dollars)');
title('Cost/unit as a function of number of units');
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This work is licensed by Anthony Antonacci under a Creative Commons Attribution License (CC-BY 2.0).
Last edited by Anthony Antonacci on Aug 2, 2006 8:03 pm GMT-5.
"This course provides a brief introduction to LabVIEW MathScript, the textual math componenet of LabVIEW. The modules for this course include typical syntax and programming methods commonly used […]"