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- M - Defines master degrees of freedom (MDOFs) for superelement generation analyses.
 - MACOPT - Specifies modal assurance criterion (MAC) or frequency response function (FRF) correlation criteria calculation options for RSTMAC.
 - MAGOPT - Specifies options for a 3D magnetostatic field analysis.
 - MAGSOLV - Specifies magnetic solution options and initiates the solution.
 - MAP - Maps pressures from source points to target surface elements.
 - /MAP - Enters the mapping processor.
 - MAP2DTO3D - Initiates a 2D to 3D analysis and maps variables.
 - MAPSOLVE - Maps solved node and element solutions from an original mesh to a new mesh.
 - MAPVAR - Defines tensors and vectors in user-defined state variables for rezoning and in 2D to 3D analyses.
 - MASCALE - Activates scaling of the entire system matrix.
 - MASTER - Specifies "Master DOF" as the subsequent status topic.
 - MAT - Sets the element material attribute pointer.
 - MATER - Specifies "Material properties" as the subsequent status topic.
 - MAXCYCMODE - Computes the maximum results value of cyclic mode pairs at the same frequency or the amplitude of a single complex mode.
 - MCHECK - Checks mesh connectivity.
 - MCFOPT - Specifies options for the Modal Coordinates File (Jobname.mcf).
 - MDAMP - Defines the damping ratios as a function of mode.
 - MDELE - Deletes master degrees of freedom.
 - MDPLOT - Plots frequency-dependent modal damping coefficients calculated by DMPEXT.
 - MEMM - Allows the current session to keep allocated memory
 - /MENU - Activates the Graphical User Interface (GUI).
 - *MERGE - Merges two dense matrices or vectors into one.
 - MESHING - Specifies "Meshing" as the subsequent status topic.
 - *MFOURI - Calculates the coefficients for, or evaluates, a Fourier series.
 - *MFUN - Copies or transposes an array parameter matrix.
 - MGEN - Generates additional MDOF from a previously defined set.
 - MIDTOL - Sets midstep residual criterion values for structural transient analyses.
 - /MKDIR - Creates a directory.
 - MLIST - Lists the MDOF of freedom.
 - MMASS - Specifies the missing mass response calculation.
 - MMF - Calculates the magnetomotive force along a path.
 - MODCONT - Specify additional modal analysis options.
 - MODDIR - Enables remote read-only usage of modal analysis files or substructuring analysis files.
 - MODE - Specifies the harmonic loading term for this load step.
 - MODIFY - Changes the listed values of the data in a set.
 - MODMSH - Controls the relationship of the solid model and the FE model.
 - MODSELOPTION - Specifies the criteria for selecting the modes to be expanded.
 - MODOPT - Specifies modal analysis options.
 - MONITOR - Controls contents of variable fields in the nonlinear solution monitor file.
 - *MOPER - Performs matrix operations on array parameter matrices.
 - MOPT - Specifies meshing options.
 - MORPH - Specifies morphing and remeshing controls.
 - MOVE - Calculates and moves a node to an intersection.
 - MP - Defines a linear material property as a constant or a function of temperature.
 - MPAMOD - Modifies temperature-dependent secant coefficients of thermal expansion.
 - MPCHG - Changes the material number attribute of an element.
 - MPCOPY - Copies linear material model data from one material reference number to another.
 - MPDATA - Defines property data to be associated with the temperature table.
 - MPDELE - Deletes linear material properties.
 - MPDRES - Reassembles existing material data with the temperature table.
 - /MPLIB - Sets the default material library read and write paths.
 - MPLIST - Lists linear material properties.
 - MPPLOT - Plots linear material properties as a function of temperature.
 - MPREAD - Reads a file containing material properties.
 - MPRINT - Specifies that radiation matrices are to be printed.
 - MPTEMP - Defines a temperature table for material properties.
 - MPTGEN - Adds temperatures to the temperature table by generation.
 - MPTRES - Restores a temperature table previously defined.
 - MPWRITE - Writes linear material properties in the database to a file (if the LIB option is not specified) or writes both linear and nonlinear material properties (if LIB is specified) from the database to a file.
 - /MREP - Enables you to reissue the graphics command macro "name" during a replot or zoom operation.
 - MRPM - Defines the revolutions per minute (RPM) for a machine rotation.
 - *MSG - Writes an output message via the Mechanical APDL message subroutine.
 - MSHAPE - For elements that support multiple shapes, specifies the element shape to be used for meshing.
 - MSHCOPY - Simplifies the generation of meshes that have matching node element patterns on two different line groups (in 2D) or area groups (3D).
 - MSHKEY - Specifies whether free meshing or mapped meshing should be used to mesh a model.
 - MSHMID - Specifies placement of midside nodes.
 - MSHOPTIM - Optimizes a selected mesh based on predefined finite element specifications.
 - MSHPATTERN - Specifies pattern to be used for mapped triangle meshing.
 - MSOLVE - Starts multiple solutions for an acoustic analysis.
 - MSOPT - Specifies solution options for a multistage cyclic symmetry analysis.
 - /MSTART - Controls the initial GUI components.
 - MSTOLE - Adds two extra nodes from FLUID116 elements to SURF151 or SURF152 elements for convection analyses.
 - *MULT - Performs the matrix multiplication M3 = M1(T1)*M2(T2).
 - *MWRITE - Writes a matrix to a file in a formatted sequence.
 - MXPAND - Specifies modal or buckling analysis expansion options.