GCBASIC / Discussion / Help: math power function

math power function

Forum: Help

Creator: stan cartwright

Created: 2017-02-20

Updated: 2017-02-20

stan cartwright - 2017-02-20

I tried to use the power command
plot2screenram:
pixel = py%8 ; pixel position
pixel=power(1,pixel)
ptr=((py/8)*128)+px ;screen byte
buffer (ptr)=buffer (ptr) or pixel ;plot pixel in buffer
and get this error.
gcb_plot-not-working.gcb (150): Error: Invalid variable name: POWER1,PIXEL
gcb_plot-not-working.gcb (150): Error: Variable POWER1,PIXEL was not explicitly declared
gcb_plot-not-working.gcb (187): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (187): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (187): Error: Variable POWER(1,PIXEL) was not explicitly declared
gcb_plot-not-working.gcb (191): Error: Variable ROW was not explicitly declared
gcb_plot-not-working.gcb (202): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (202): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (217): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (217): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (231): Error: Cannot store -1 in the byte variable SY
gcb_plot-not-working.gcb (245): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (245): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (268): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (268): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (298): Error: Cannot store -1 in the byte variable SY
gcb_plot-not-working.gcb (310): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (310): Error: Invalid variable name: POWER(1,PIXEL)
gcb_plot-not-working.gcb (332): Error: Array/Function PIXEL=POWER has not been declared
gcb_plot-not-working.gcb (332): Error: Invalid variable name: POWER(1,PIXEL)

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Anobium - 2017-02-20

I am guessing you are using a stock installation of Great Cow BASIC, version 0.96.0.

No idea what is causing this error.

Please post your user code, or, a section that should compile to reproduce the error.

Best to do this whenever you post. Use add attachment for user code.

Have you looked at the demo's? Is there a power example?
I just tried the Help file example and that compiles ok.

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William Roth - 2017-02-22

The errors are symptomatic of not including maths.h in the source code

Make sure the following line is in the GCB source code

#include <Maths.h>

Without seeing the GCB source code, not much more help can be provided.

Last edit: William Roth 2017-02-22
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stan cartwright - 2017-02-23

Thanks. just power and logs,I didn't notice works with <maths.h></maths.h>

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math power function

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math power function