# 3dMax¶

```
Usage: 3dBrickStat [options] dataset
Compute maximum and/or minimum voxel values of an input dataset
The output is a number to the console. The input dataset
may use a sub-brick selection list, as in program 3dcalc.
Note that this program computes ONE number as the output; e.g.,
the mean over all voxels and time points. If you want (say) the
mean over all voxels but for each time point individually, see
program 3dmaskave.
Note: If you don't specify one sub-brick, the parameter you get
----- back is computed from all the sub-bricks in dataset.
Options :
-quick = get the information from the header only (default)
-slow = read the whole dataset to find the min and max values
all other options except min and max imply slow
-min = print the minimum value in dataset
-max = print the maximum value in dataset (default)
-mean = print the mean value in dataset
-sum = print the sum of values in the dataset
-var = print the variance in the dataset
-stdev = print the standard deviation in the dataset
-stdev and -var are mutually exclusive
-count = print the number of voxels included
-volume = print the volume of voxels included in microliters
-positive = include only positive voxel values
-negative = include only negative voxel values
-zero = include only zero voxel values
-non-positive = include only voxel values 0 or negative
-non-negative = include only voxel values 0 or greater
-non-zero = include only voxel values not equal to 0
-absolute = use absolute value of voxel values for all calculations
can be combined with restrictive non-positive, non-negative,
etc. even if not practical. Ignored for percentile and
median computations.
-nan = include only voxel values that are finite numbers,
not NaN, or inf. -nan forces -slow mode.
-nonan =exclude voxel values that are not numbers
-mask dset = use dset as mask to include/exclude voxels
-mrange MIN MAX = Only accept values between MIN and MAX (inclusive)
from the mask. Default it to accept all non-zero
voxels.
-mvalue VAL = Only accept values equal to VAL from the mask.
-automask = automatically compute mask for dataset
Can not be combined with -mask
-percentile p0 ps p1 write the percentile values starting
at p0% and ending at p1% at a step of ps%
Output is of the form p% value p% value ...
Percentile values are output first.
Only one sub-brick is accepted as input with this option.
Write the author if you REALLY need this option
to work with multiple sub-bricks.
-perclist NUM_PERC PERC1 PERC2 ...
Like -percentile, but output the given percentiles, rather
than a list on an evenly spaced grid using 'ps'.
-median a shortcut for -percentile 50 1 50 (or -perclist 1 50)
-perc_quiet = only print percentile results, not input percentile cutoffs
-ver = print author and version info
-help = print this help screen
INPUT DATASET NAMES
-------------------
This program accepts datasets that are modified on input according to the
following schemes:
'r1+orig[3..5]' {sub-brick selector}
'r1+orig<100..200>' {sub-range selector}
'r1+orig[3..5]<100..200>' {both selectors}
'3dcalc( -a r1+orig -b r2+orig -expr 0.5*(a+b) )' {calculation}
For the gruesome details, see the output of 'afni -help'.
++ Compile date = May 7 2021 {AFNI_21.1.06:linux_ubuntu_16_64}
```