# What is the difference between mtxcalc and IOAPI3.1 and Ioapi3.2?

**URL:** <https://forum.cmascenter.org/t/what-is-the-difference-between-mtxcalc-and-ioapi3-1-and-ioapi3-2/1671>\
**Category:** m3tools\
**Created:** [July 26, 2020, 4:11am UTC](https://forum.cmascenter.org/t/what-is-the-difference-between-mtxcalc-and-ioapi3-1-and-ioapi3-2/1671 "2020-07-26T04:11:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qinch18](https://avatars.discourse-cdn.com/v4/letter/q/71e660/32.png) [@qinch18](https://forum.cmascenter.org/u/qinch18)\
**Post date:** [July 26, 2020, 4:11am UTC](https://forum.cmascenter.org/t/what-is-the-difference-between-mtxcalc-and-ioapi3-1-and-ioapi3-2/1671/1 "2020-07-26T04:11:45Z")

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Hello, Why did I successfully run mtxcalc in IOAPI3.1 in a few minutes, while the same process I did in Version 3.2 was running for more than a dozen hours and there’s no output?

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**Author:** ![bbaek](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/bbaek/32/22_2.png) [@bbaek](https://forum.cmascenter.org/u/bbaek)\
**Post date:** [August 24, 2020, 2:22pm UTC](https://forum.cmascenter.org/t/what-is-the-difference-between-mtxcalc-and-ioapi3-1-and-ioapi3-2/1671/2 "2020-08-24T14:22:20Z")

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> **[cjcoats/ioapi-3.2](https://github.com/cjcoats/ioapi-3.2/commits/master/m3tools/mtxcalc.f90)**
>
> I/O API Version 3.2: new, beta. Contribute to cjcoats/ioapi-3.2 development by creating an account on GitHub.