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For..Do Loop and If statements [message #94095]

Wed, 18 January 2017 21:18

smnadoum
Messages: 24
Registered: June 2016

Junior Member

I have written a couple of for.. do loops, however, they don't work properly. Not sure what I did wrong.

1) I want to use a for..do loop and if statements to derive indices. where 'a' is greater than 5, and output the result to new variable 'b2'

a is INT = Array[4, 5, 3]
b2=[a]
b2=[]
for i=0, n_elements(a) -1 do begin
temp =a[i]
if temp gt 5 then b2=[b2,temp]

2) I want to loop through the elements of d and use an if statement: if the element of d is equal to 20 then divid that element by a floating point 5, and if the element is not equal to 20 then divide it by a floating point 3.

d is INT = Array[4, 5]
for i=0, n_elements(d)-1 do begin ;if statement eq to 20 then divid by 5. ne 20 then divide by 3.
if d(i) eq 20 then print, 20/5.
if d(i) ne 20 then print, 20/3.
endfor
end

None of these statements work and I don't know why.

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[Message index]

		For..Do Loop and If statements By: smnadoum on Wed, 18 January 2017 21:18
		Re: For..Do Loop and If statements By: Helder Marchetto on Thu, 19 January 2017 01:06
		Re: For..Do Loop and If statements By: Markus Schmassmann on Thu, 19 January 2017 02:44
		Re: For..Do Loop and If statements By: Heinz Stege on Thu, 19 January 2017 09:43

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