ERR:INVALID DIM
Texas Instruments TI-84 Calculator
Severity: MinorWhat Does This Error Mean?
ERR:INVALID DIM means there is a problem with list or matrix dimensions. This commonly happens when you have data in a stat plot list that does not exist, or when matrix dimensions do not match for an operation. Check your stat plots and list/matrix sizes.
Affected Models
- TI-84 Plus
- TI-84 Plus CE
- TI-84 Plus Silver Edition
- TI-83 Plus
- TI-Nspire (TI-84 mode)
Common Causes
- Stat Plot turned on but references an empty or non-existent list
- Two lists in a stat plot have different lengths
- Matrix multiplication with incompatible dimensions
- Trying to add or subtract matrices of different sizes
- Regression with mismatched X and Y list lengths
How to Fix It
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Turn off unused Stat Plots: press 2nd > STAT PLOT > PlotsOff.
This is the #1 cause. A stat plot referencing L1 or L2 that contains old or deleted data triggers this error. Turning off all plots is the quickest fix.
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Check that lists used together have the same length.
If L1 has 10 entries and L2 has 8, any operation using both lists gives ERR:INVALID DIM. Press STAT > Edit to view and fix your lists.
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For matrices: check dimensions before multiplying.
To multiply matrix [A] (m x n) by [B], matrix [B] must have n rows. Press 2nd > MATRIX > select the matrix to see its dimensions.
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Clear all lists if you want a fresh start: press MEM > ClrAllLists.
Press 2nd > MEM > 4:ClrAllLists > ENTER. This empties all lists and resolves most ERR:INVALID DIM issues.
Frequently Asked Questions
Why do stat plots cause this error when I am not using them?
Stat plots stay turned on even when you are not looking at them. If a plot references L1 and you clear L1 for a different purpose, the plot still tries to use the now-empty list and triggers ERR:INVALID DIM.
What does DIM stand for?
DIM stands for dimension — the size of a list or matrix. A list with 5 entries has dimension 5. A 3x2 matrix has dimensions 3 rows by 2 columns.