The biggest problem is you're trying to deal with numeric data as string -- convert to numeric. This, unfortunately, isn't handled at all well by MATLAB out of the box when using European conventions as MATLAB ignores the user locale setting for numeric values. This is, in this day and age, truly embarrassing for TMW imo.
However, for simple cases like this, it's easy enough to work around...
>> load Table_3 % load the example table; see what looks like...
>> head(Table_3)
ans =
8×7 table
StepID StepID_1 Voltage Voltage_1 Current Current_1 IR
______________ ___________ __________ __________ ____________ _________ _________
{'2 CC_DChg' } {'3 Rest' } {'4,0057'} {'4,0848'} {'-135,993'} 0.00 {'0,582'}
{'5 CC_DChg' } {'6 Rest' } {'3,9434'} {'4,0042'} {'-67,969' } 0.00 {'0,895'}
{'7 CC_DChg' } {'8 Rest' } {'3,9124'} {'3,9955'} {'-135,956'} 0.00 {'0,611'}
{'10 CC_DChg'} {'11 Rest'} {'3,8581'} {'3,9245'} {'-67,987' } 0.00 {'0,977'}
{'12 CC_DChg'} {'13 Rest'} {'3,8284'} {'3,9155'} {'-136,012'} 0.00 {'0,64' }
{'15 CC_DChg'} {'16 Rest'} {'3,7701'} {'3,851' } {'-67,987' } 0.00 {'1,19' }
{'17 CC_DChg'} {'18 Rest'} {'3,7506'} {'3,8392'} {'-135,956'} 0.00 {'0,652'}
{'20 CC_DChg'} {'21 Rest'} {'3,6845'} {'3,7478'} {'-67,969' } 0.00 {'0,931'}
>>
>> Table_3.IR=str2double(strrep(Table_3.IR,',','.')); % convert the IR variable to numeric; swap '.' for ',' to do so
>> head(Table_3) % now see what that looks like...
ans =
8×7 table
StepID StepID_1 Voltage Voltage_1 Current Current_1 IR
______________ ___________ __________ __________ ____________ _________ ____
{'2 CC_DChg' } {'3 Rest' } {'4,0057'} {'4,0848'} {'-135,993'} 0.00 0.58
{'5 CC_DChg' } {'6 Rest' } {'3,9434'} {'4,0042'} {'-67,969' } 0.00 0.90
{'7 CC_DChg' } {'8 Rest' } {'3,9124'} {'3,9955'} {'-135,956'} 0.00 0.61
{'10 CC_DChg'} {'11 Rest'} {'3,8581'} {'3,9245'} {'-67,987' } 0.00 0.98
{'12 CC_DChg'} {'13 Rest'} {'3,8284'} {'3,9155'} {'-136,012'} 0.00 0.64
{'15 CC_DChg'} {'16 Rest'} {'3,7701'} {'3,851' } {'-67,987' } 0.00 1.19
{'17 CC_DChg'} {'18 Rest'} {'3,7506'} {'3,8392'} {'-135,956'} 0.00 0.65
{'20 CC_DChg'} {'21 Rest'} {'3,6845'} {'3,7478'} {'-67,969' } 0.00 0.93
>> Table_3.StepID=categorical(Table_3.StepID); % also, the ID variables are categorical...convert
>> head(Table_3)
ans =
8×7 table
StepID StepID_1 Voltage Voltage_1 Current Current_1 IR
__________ ___________ __________ __________ ____________ _________ ____
2 CC_DChg {'3 Rest' } {'4,0057'} {'4,0848'} {'-135,993'} 0.00 0.58
5 CC_DChg {'6 Rest' } {'3,9434'} {'4,0042'} {'-67,969' } 0.00 0.90
7 CC_DChg {'8 Rest' } {'3,9124'} {'3,9955'} {'-135,956'} 0.00 0.61
10 CC_DChg {'11 Rest'} {'3,8581'} {'3,9245'} {'-67,987' } 0.00 0.98
12 CC_DChg {'13 Rest'} {'3,8284'} {'3,9155'} {'-136,012'} 0.00 0.64
15 CC_DChg {'16 Rest'} {'3,7701'} {'3,851' } {'-67,987' } 0.00 1.19
17 CC_DChg {'18 Rest'} {'3,7506'} {'3,8392'} {'-135,956'} 0.00 0.65
20 CC_DChg {'21 Rest'} {'3,6845'} {'3,7478'} {'-67,969' } 0.00 0.93
>>
The rest should be apparent to finish cleaning up the table; then you can use the data as numeric and direct numeric comparisons for the logic tests. Text comparisons of straight numeric float strings won't work for relational numeric comparisons; that's doing a strict lexical comparison, not numeric.
There is a way to work around the MATLAB limitations in a more generic fashion but it takes more work up front -- see Yair Altman's undocumented site at <Formatting-numbers> for using the Java engine instead that is locale aware.
