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  • This module is included in aLens by: National InstrumentsAs a part of collection:"Introduction to LabVIEW MathScript"

    Comments:

    "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 […]"

    Click the "National Instruments" link to see all content affiliated with them.

    National Instruments
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  • This module is included inLens: Digital Signal Processing with NI LabVIEW and the National Instruments Platform
    By: Sam ShearmanAs a part of collection:"Introduction to LabVIEW MathScript"

    Comments:

    "Tutorial / Introduction to LabVIEW MathScript, a text-based component of National Instruments LabVIEW that allows you to run your .m file scripts in LabVIEW Virtual Instruments."

    Click the "NI Signal Processing" link to see all content selected in this lens.

    NI Signal Processing
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Programming in LabVIEW MathScript-Simple For Loop Exercises

Module by: Anthony Antonacci, Darryl Morrell Based on: Programming in MATLAB-Simple For Loop Exercises by Darryl Morrell

Summary: This module provides several simple exercises designed to test and increase your understanding of for loops in LabVIEW MathScript.

Some For Loop Exercises

Problem 1: Loop Indices
How many times will this program print "Hello World"? 
for a=0:50
    disp('Hello World')
end
[ Click for Solution 1 ]
Solution 1
The code 0:50 creates a vector of integers starting at 0 and going to 50; this vector has 51 elements. "Hello World" will be printed once for each element in the vector (51 times).
[ Hide Solution 1 ]
Problem 2: Loop Indices II
How many times will this program print "Guten Tag Welt"? 
for a=-1:-1:-50
    disp('Guten Tag Welt')
end
[ Click for Solution 2 ]
Solution 2
The code -1:-1:-50 creates a vector of integers starting at -1 and going backward to -50; this vector has 50 elements. "Guten Tag Welt" will be printed once for each element in the vector (50 times).
[ Hide Solution 2 ]
Problem 3: Loop Indices III
How many times will this program print "Bonjour Monde"? 
for a=-1:1:-50
    disp('Bonjour Monde')
end
[ Click for Solution 3 ]
Solution 3
The code -1:1:-50 creates an empty vector with no elements. Since this is an empty vector the following error occurs: "Error in function range at line 1. You cannot specify a step size of zero for a range."
[ Hide Solution 3 ]
Problem 4: Nested Loops
How many times will this program print "Hola Mundo"? 
for a=10:10:50
    for b=0:0.1:1
        disp('Hola Mundo')
    end
end
[ Click for Solution 4 ]
Solution 4
The outer loop (the loop with a) will be executed five times. Each time the outer loop is executed, the inner loop (the loop with b) will be executed eleven times, since 0:0.1:1 creates a vector with 11 elements. "Hola Mundo" will be printed 55 times.
[ Hide Solution 4 ]
Problem 5: A tricky loop
What sequence of numbers will the following for loop print? 
n = 10;
for j = 1:n
    n = n-1;
    j
end
Explain why this code does what it does.
[ Click for Solution 5 ]
Solution 5
In the first line, the value of n is set to 10. The code 1:n creates a vector of integers from 1 to 10. Each iteration through the loop sets j to the next element of this vector, so j will be sent to each value 1 through 10 in succession, and this sequence of values will be printed. Note that each time through the loop, the value of n is decreased by 1; the final value of n will be 0. Even though the value of n is changed in the loop, the number of iterations through the loop is not affected, because the vector of integers is computed once before the loop is executed and does not depend on subsequent values of n.
[ Hide Solution 5 ]
Problem 6: Nested Loops II
What value will the following program print? 
count = 0;
for d = 1:7
   for h = 1:24
      for m = 1:60
         for s = 1:60
            count = count + 1;
         end
      end
   end
end
count
What is a simpler way to achieve the same results?
[ Click for Solution 6 ]
Solution 6
The d loop will be executed seven times. In each iteration of the d loop, the h loop will be executed 24 times. In each iteration of the h loop, the m loop will be executed 60 times. In each iteration of the m loop, the s loop will be executed 60 times. So the variable count will be incremented 7 × 24 × 60 × 60 = 604800 7 24 60 60 604800 times.
A simpler way to achieve the same results is the command 
7*24*60*60
[ Hide Solution 6 ]
Problem 7: Multiple Hypotenuses
RT.png
Figure 1: Sides of a right triangle.
Consider the right triangle shown in Figure 1. Suppose you wish to find the length of the hypotenuse c c of this triangle for several combinations of side lengths a a and b b ; the specific combinations of a a and b b are given in Table 1. Write a LABVIEW MATHSCRIPT's program to do this.
Side Lengths
a a b b
1 1
1 2
2 3
4 1
2 2
[ Click for Solution 7 ]
Solution 7
This solution was created by Heidi Zipperian: 
a=[1 1 2 4 2]
b=[1 2 3 1 2]
for j=1:5
    c=sqrt(a(j)^2+b(j)^2)
end
A solution that does not use a for loop was also created by Heidi: 
a=[1 1 2 4 2]
b=[1 2 3 1 2]
c=sqrt(a.^2+b.^2)
[ Hide Solution 7 ]

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