Evaluate a string as a column name

Hi, 

I'm new to Power BI and I'm having some troubles trying to evaluate a string as a column name.

I have a big table like

BIG TABLE

Field1, Field2, ..., Field30

0.3, 0.4, ..., 0.2

0.5, 0.2, ..., 0.88

...

and a slider like

FIELDS

FIELD_X

Field1,

Field2, 

...,

Field30

I get what I select on the slider as Selected_X = SELECTEDVALUE(FIELDS[FIELD_X]). So, if I select "Field13" on FIELD_X I get Selected_X ="Field13". 

Now I want a columnX to become dynamically equal to 'BIG TABLE'[Field13].

I tried column_X="'BIG TABLE'[" & Selected_X & "]" but it didn't work.

How can I get this?

Thanks, 

Carla

Hello,

Is there a key to this table? I'm assumin you will need another filter to see what row you are reffering too? 

One way is you can unpivot your table.
Go to advanced editor. If you have a key, select that column, If not add an index in Add Coulmn > Index Column. Select this new column.

Click Transform tab. On the "Unpivot Columns" dropdown, Click "Unpivot Other Columns". It will now give you Attribute and Value column. Attribute is your column name (FIELD X), which you can use in your slicer.