## STACK Documentation

Documentation home | Category index | Site map# AlgEquivNouns: Answer test results

This page exposes the results of running answer tests on STACK test cases. This page is automatically generated from the STACK unit tests and is designed to show question authors what answer tests actually do. This includes cases where answer tests currentl fail, which gives a negative expected mark. Comments and further test cases are very welcome.

## AlgEquivNouns

Test | ? | Student response | Teacher answer | Opt | Mark | Answer note | |
---|---|---|---|---|---|---|---|

AlgEquivNouns | 1/0 |
1 |
-1 | ATAlgEquivNouns_STACKERROR_SAns. | |||

TEST_FAILED | |||||||

The answer test failed to execute correctly: please alert your teacher. Division by zero. | |||||||

AlgEquivNouns | 1 |
1/0 |
-1 | ATAlgEquivNouns_STACKERROR_TAns. | |||

TEST_FAILED | |||||||

The answer test failed to execute correctly: please alert your teacher. Division by zero. | |||||||

AlgEquivNouns | (x-1)^2 |
-1 | ATAlgEquivNounsTEST_FAILED-Empty SA. | ||||

The answer test failed to execute correctly: please alert your teacher. Attempted to execute an answer test with an empty student answer, probably a CAS validation problem when authoring the question. | |||||||

AlgEquivNouns | x^2 |
-1 | ATAlgEquivNounsTEST_FAILED-Empty TA. | ||||

The answer test failed to execute correctly: please alert your teacher. Attempted to execute an answer test with an empty teacher answer, probably a CAS validation problem when authoring the question. | |||||||

AlgEquivNouns | x-1)^2 |
(x-1)^2 |
-1 | ATAlgEquivNounsTEST_FAILED-Empty SA. | |||

The answer test failed to execute correctly: please alert your teacher. Attempted to execute an answer test with an empty student answer, probably a CAS validation problem when authoring the question. | |||||||

AlgEquivNouns | diff(x^2,x) |
2*x |
1 | ||||

AlgEquivNouns | diff(x^2,x) |
'diff(x^2,x) |
0 | ||||

AlgEquivNouns | diff(x^2,x) |
'diff(x^2,x) |
0 | ||||

AlgEquivNouns | 'diff(y,x) |
noundiff(y,x) |
1 | ||||

AlgEquivNouns | diff(y,x) |
0 |
1 | ||||

AlgEquivNouns | 'diff(y,x) |
0 |
0 | ||||

AlgEquivNouns | noundiff(y,x) |
0 |
0 | ||||

AlgEquivNouns | diff(y(x),x) |
0 |
0 | ||||

AlgEquivNouns | 'diff(y,x,1) |
'diff(y,x,2) |
0 | ||||

AlgEquivNouns | 'diff(y(x),x) |
'diff(y,x) |
0 | ||||

AlgEquivNouns | subst(y,y(x),'diff(y,x)+y =1) |
'diff(y,x)+y=1 |
1 | ATEquation_sides | |||

AlgEquivNouns | subst(y,y(x),'diff(y(x),x )+y(x)=1) |
'diff(y,x)+y=1 |
1 | ATEquation_sides | |||

AlgEquivNouns | subst(y(x),y,'diff(y,x)+y =1) |
'diff(y(x),x)+y(x)=1 |
1 | ATEquation_sides | |||

AlgEquivNouns | subst(y(x),y,'diff(y,x)+y =1) |
'diff(y,x)+y=1 |
0 | ATEquation_default | |||

AlgEquivNouns | subst(y(x),y,'diff(y(x),x )+y(x)=1) |
'diff(y,x)+y=1 |
-1 | ATAlgEquivNouns_STACKERROR_SAns. | |||

TEST_FAILED | |||||||

The answer test failed to execute correctly: please alert your teacher. subst: cannot substitute y(x) for operator y in expression y(x) | |||||||

AlgEquivNouns | y_x |
'diff(y,x) |
0 | ||||

Partials | |||||||

AlgEquivNouns | noundiff(f,x,1,y,1) |
noundiff(noundiff(f,x),y) |
1 | ||||

AlgEquivNouns | noundiff(noundiff(f,y),x) |
noundiff(noundiff(f,x),y) |
1 | ||||

AlgEquivNouns | noundiff(noundiff(f,x),x) |
noundiff(f,x,2) |
1 | ||||

Differential equations | |||||||

AlgEquivNouns | noundiff(H,x,2) = -R/T |
noundiff(H,x,2) + R/T = 0 |
1 | ATEquation_ratio | |||

AlgEquivNouns | 'diff(H,x,2) = -R/T |
noundiff(H,x,2) + R/T = 0 |
1 | ATEquation_ratio | |||

AlgEquivNouns | y(t)=int(s^2,s,0,t) |
y(t)=t^3/3 |
1 | ATEquation_sides | |||

AlgEquivNouns | y(t)='int(s^2,s,0,t) |
y(t)=t^3/3 |
0 | ATEquation_lhs_notrhs | |||

AlgEquivNouns | y(t)='int(s^2,s,0,t) |
y(t)=nounint(s^2,s,0,t) |
1 | ATEquation_sides | |||

Logic nouns are still evaluated | |||||||

AlgEquivNouns | true nounand false |
false |
1 | ATLogic_True. |

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