Bash - assign variables to yad values - sed usage in for loop - bash

Question

In the code below I am attempting to assign variables to the two yad values Radius and Amount.
This can be done with awk by printing the yad values to file but I want to avoid this if I can.
The string (that is, both yad values) is assigned a variable and trimmed of characters, as required, using sed. However, the script stops at this line;
radius=$(sed 's|[amount*,]||g')
Two questions
is there a better way of tackling this; and
why is the script not completing? I have not been able to figure out the syntax.
EDIT: don't need the loop and working on the sed syntax
#!/bin/bash
#ifs.sh
values=`yad --form --center --width=300 --title="Test" --separator=' ' \
--button=Skip:1 \
--button=Apply:0 \
--field="Radius":NUM \
'0!0..30!1!0' \
--field="Amount":NUM \
'0!0..5!0.01!2'`
radius=$(echo "$values" | sed 's|[amount*,]||g')
amount=$(echo "$values" | sed 's/.a://')
if [ $? = 1 ]; then
echo " " >/dev/null 2>&1; else
echo "Radius = $radius"
echo "Amount = $amount"
fi
exit
Alternatives
# with separator
# radius="${values%????????}"
# amount="${values#????????}"
# without separator
# radius=$(echo "$values" | sed s'/........$//')
# amount=$(echo "$values" | sed 's/^........//')

Answer 1

It's easier than you think:
$ values=( $(echo '7.000000 0.100000 ') )
$ echo "${values[0]}"
7.000000
$ echo "${values[1]}"
0.100000
Replace $(echo '7.000000 0.100000 ') with yad ... so the script would be:
values=( $(yad --form --center --width=300 --title="Test" --separator=' ' \
--button=Skip:1 \
--button=Apply:0 \
--field="Radius":NUM \
'0!0..30!1!0' \
--field="Amount":NUM \
'0!0..5!0.01!2') )
if [ $? -eq 0 ]; then
echo "Radius = ${values[0]}"
echo "Amount = ${values[1]}"
fi

Answer 2

EDIT: Changed answer based on #Ed Morton
#!/bin/bash
#ifs.sh
values=($(yad --form --center --width=300 --title="Test" --separator=' ' \
--button=Skip:1 \
--button=Apply:0 \
--field="Radius":NUM \
'0!0..30!1!0' \
--field="Amount":NUM \
'0!0..5!0.01!2'))
if [ $? -eq 0 ]; then
radius="${values[0]}"
amount="${values[1]}"
fi
exit
bash -x Output
+ '[' 0 -eq 0 ']'
+ radius=7.000000
+ amount=1.000000
+ exit